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 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of Condensed Statement of Comprehensive Income [Line Items]                
Net income (loss) $ (70,951) $ (22,877) $ (28,796) $ (20,311) $ (29,888) $ (39,809) $ (122,624) $ (90,008)
Other comprehensive income (loss), net of tax:                
Currency translation difference on related borrowings (315)     170     (484) 438
Currency translation difference on foreign currency net investments 162     1,217     (2,216) 2,666
Total other comprehensive income (loss), net of tax: (153) $ (2,247) $ (300) 1,387 $ 871 $ 846 (2,700) 3,104
Comprehensive income (loss) attributable to controlling interest (71,104)     (18,924)     (125,324) (86,904)
Reportable Legal Entities | Parent                
Schedule of Condensed Statement of Comprehensive Income [Line Items]                
Net income (loss) (70,951)     (20,311)     (122,624) (90,008)
Other comprehensive income (loss), net of tax:                
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) attributable to controlling interest (70,951)     (20,311)     (122,624) (90,008)
Reportable Legal Entities | Guarantor                
Schedule of Condensed Statement of Comprehensive Income [Line Items]                
Net income (loss) (36,039)     (3,996)     (48,221) (28,283)
Other comprehensive income (loss), net of tax:                
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) attributable to controlling interest (36,039)     (3,996)     (48,221) (28,283)
Reportable Legal Entities | Non-Guarantor                
Schedule of Condensed Statement of Comprehensive Income [Line Items]                
Net income (loss) (21,549)     (4,176)     (36,818) (17,491)
Other comprehensive income (loss), net of tax:                
Currency translation difference on related borrowings (315)     170     (484) 438
Currency translation difference on foreign currency net investments 162     1,217     (2,216) 2,666
Total other comprehensive income (loss), net of tax: (153)     1,387     (2,700) 3,104
Comprehensive income (loss) attributable to controlling interest (21,702)     (2,789)     (39,518) (14,387)
Eliminations                
Schedule of Condensed Statement of Comprehensive Income [Line Items]                
Net income (loss) 57,588     8,172     85,039 45,774
Other comprehensive income (loss), net of tax:                
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) attributable to controlling interest $ 57,588     $ 8,172     $ 85,039 $ 45,774