Quarterly report pursuant to Section 13 or 15(d)

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 - Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) $ (28,796) $ (39,809)
Other comprehensive income (loss), net of tax:    
Currency translation difference on related borrowings 276 83
Currency translation difference on foreign currency net investments (576) 763
Total other comprehensive income (loss), net of tax: (300) 846
Comprehensive income (loss) attributable to controlling interest (29,096) (38,963)
Reportable Legal Entities | Parent    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (28,795) (39,808)
Other comprehensive income (loss), net of tax:    
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) attributable to controlling interest (28,795) (39,808)
Reportable Legal Entities | Guarantor    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (9,117) (15,588)
Other comprehensive income (loss), net of tax:    
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) attributable to controlling interest (9,117) (15,588)
Reportable Legal Entities | Non-Guarantor    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) (7,256) (6,193)
Other comprehensive income (loss), net of tax:    
Currency translation difference on related borrowings 276 83
Currency translation difference on foreign currency net investments (576) 763
Total other comprehensive income (loss), net of tax: (300) 846
Comprehensive income (loss) attributable to controlling interest (7,556) (5,347)
Eliminations    
Schedule of Condensed Statement of Comprehensive Income [Line Items]    
Net income (loss) 16,372 21,780
Other comprehensive income (loss), net of tax:    
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) attributable to controlling interest $ 16,372 $ 21,780