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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) $ (22,877) $ (29,888) $ (51,673) $ (69,697)
Other comprehensive income (loss), net of tax:        
Currency translation difference on related borrowings (445) 185 (169) 268
Currency translation difference on foreign currency net investments (1,802) 686 (2,378) 1,449
Total other comprehensive income (loss), net of tax: (2,247) 871 (2,547) 1,717
Comprehensive income (loss) attributable to controlling interest (25,124) (29,017) (54,220) (67,980)
Reportable Legal Entities | Parent        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (22,877) (29,888) (51,673) (69,696)
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 (22,877) (29,888) (51,673) (69,696)
Reportable Legal Entities | Guarantor        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (3,069) (8,698) (12,188) (24,287)
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 (3,069) (8,698) (12,188) (24,287)
Reportable Legal Entities | Non-Guarantor        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (8,010) (7,125) (15,263) (13,316)
Other comprehensive income (loss), net of tax:        
Currency translation difference on related borrowings (445) 185 (169) 268
Currency translation difference on foreign currency net investments (1,802) 686 (2,378) 1,449
Total other comprehensive income (loss), net of tax: (2,247) 871 (2,547) 1,717
Comprehensive income (loss) attributable to controlling interest (10,257) (6,254) (17,810) (11,599)
Eliminations        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) 11,079 15,823 27,451 37,602
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 $ 11,079 $ 15,823 $ 27,451 $ 37,602