Quarterly report pursuant to Section 13 or 15(d)

Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Details)

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Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) $ (48,482) $ 12,877 $ (58,638) $ 16,322
Currency translation difference on related borrowings (1,285) (1,780) (2,308) (2,248)
Currency translation difference on foreign currency net investments 588 615 1,462 1,126
Total other comprehensive income (loss), net of tax: (697) (1,165) (846) (1,122)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (49,261) 11,423 (60,055) 14,677
Comprehensive (loss) attributable to noncontrolling interest (82) (289) (571) (523)
Comprehensive income (loss) attributable to controlling interest (49,179) 11,712 (59,484) 15,200
Parent [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (48,620) 12,566 (59,427) 15,698
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments 0 0 0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (48,620) 12,566 (59,427) 15,698
Comprehensive (loss) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest (48,620) 12,566 (59,427) 15,698
Guarantor [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (4,119) 19,980 (8,984) 54,169
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments 0 0 0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (4,119) 19,980 (8,984) 54,169
Comprehensive (loss) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest (4,119) 19,980 (8,984) 54,169
Non-Guarantor [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (25,656) (227) (19,543) (2,954)
Currency translation difference on related borrowings (1,285) (1,780) (2,308) (2,248)
Currency translation difference on foreign currency net investments 588 615 1,462 1,126
Total other comprehensive income (loss), net of tax: (697) (1,165) (846) (1,122)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (26,435) (1,681) (20,960) (4,599)
Comprehensive (loss) attributable to noncontrolling interest (82) (289) (571) (523)
Comprehensive income (loss) attributable to controlling interest (26,353) (1,392) (20,389) (4,076)
Eliminations [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) 29,913 (19,442) 29,316 (50,591)
Currency translation difference on related borrowings 0 0 0 0
Currency translation difference on foreign currency net investments 0 0 0 0
Total other comprehensive income (loss), net of tax: 0 0 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 29,913 (19,442) 29,316 (50,591)
Comprehensive (loss) attributable to noncontrolling interest 0 0 0 0
Comprehensive income (loss) attributable to controlling interest $ 29,913 $ (19,442) $ 29,316 $ (50,591)