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, 2017
Mar. 31, 2016
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) $ (39,809) $ (95,835)
Currency translation difference on related borrowings 83 502
Currency translation difference on foreign currency net investments 763 (1,538)
Other Comprehensive Income (Loss), Net of Tax 846 (1,036)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (38,963)  
Comprehensive loss (38,963) (96,871)
Parent [Member]    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (39,808) (95,835)
Currency translation difference on related borrowings 0 0
Currency translation difference on foreign currency net investments 0 0
Other Comprehensive Income (Loss), Net of Tax 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (39,808)  
Comprehensive loss   (95,835)
Guarantor [Member]    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (15,588) (14,313)
Currency translation difference on related borrowings 0 0
Currency translation difference on foreign currency net investments 0 0
Other Comprehensive Income (Loss), Net of Tax 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (15,588)  
Comprehensive loss   (14,313)
Non-Guarantor [Member]    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (6,193) (1,912)
Currency translation difference on related borrowings 83 502
Currency translation difference on foreign currency net investments 763 (1,538)
Other Comprehensive Income (Loss), Net of Tax 846 (1,036)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (5,347)  
Comprehensive loss   (2,948)
Consolidation, Eliminations [Member]    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) 21,780 16,225
Currency translation difference on related borrowings 0 0
Currency translation difference on foreign currency net investments 0 0
Other Comprehensive Income (Loss), Net of Tax 0 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 21,780  
Comprehensive loss   $ 16,225