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
Mar. 31, 2016
Mar. 31, 2015
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) $ (95,835) $ 3,778
Currency translation difference on related borrowings 502 (1,670)
Currency translation difference on foreign currency net investments (1,538) (849)
Total other comprehensive income (loss), net of tax: (1,036) (2,519)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (96,871) 865
Comprehensive (loss) attributable to noncontrolling interest 0 (394)
Comprehensive income (loss) attributable to controlling interest (96,871) 1,259
Parent [Member]    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (95,835) 3,222
Currency translation difference on related borrowings 0 0
Currency translation difference on foreign currency net investments 0 0
Total other comprehensive income (loss), net of tax: 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (95,835) 3,222
Comprehensive (loss) attributable to noncontrolling interest 0 0
Comprehensive income (loss) attributable to controlling interest (95,835) 3,222
Guarantor [Member]    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (14,313) 2,319
Currency translation difference on related borrowings 0 0
Currency translation difference on foreign currency net investments 0 0
Total other comprehensive income (loss), net of tax: 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (14,313) 2,319
Comprehensive (loss) attributable to noncontrolling interest 0 0
Comprehensive income (loss) attributable to controlling interest (14,313) 2,319
Non-Guarantor [Member]    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (1,912) 7,225
Currency translation difference on related borrowings 502 (1,670)
Currency translation difference on foreign currency net investments (1,538) (849)
Total other comprehensive income (loss), net of tax: (1,036) (2,519)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (2,948) 4,312
Comprehensive (loss) attributable to noncontrolling interest 0 (394)
Comprehensive income (loss) attributable to controlling interest (2,948) 4,706
Eliminations [Member]    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) 16,225 (8,988)
Currency translation difference on related borrowings 0 0
Currency translation difference on foreign currency net investments 0 0
Total other comprehensive income (loss), net of tax: 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 16,225 (8,988)
Comprehensive (loss) attributable to noncontrolling interest 0 0
Comprehensive income (loss) attributable to controlling interest $ 16,225 $ (8,988)