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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) $ (20,311) $ (46,228) $ (90,008) $ (181,885)
Currency translation difference on related borrowings 170 116 438 311
Currency translation difference on foreign currency net investments 1,217 (740) 2,666 (4,506)
Other Comprehensive Income (Loss), Net of Tax 1,387 (624) 3,104 (4,195)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (18,924)      
Comprehensive loss (18,924) (46,852) (86,904) (186,080)
Parent [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (20,311) (46,228) (90,008) (181,885)
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 (20,311)      
Comprehensive loss   (46,228)    
Guarantor [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (3,996) (18,409) (28,283) (49,224)
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 (3,996)      
Comprehensive loss   (18,409)    
Non-Guarantor [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (4,176) (6,478) (17,491) (16,455)
Currency translation difference on related borrowings 170 116    
Currency translation difference on foreign currency net investments 1,217 (740)    
Other Comprehensive Income (Loss), Net of Tax 1,387 (624)    
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (2,789)      
Comprehensive loss   (7,102)    
Consolidation, Eliminations [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) 8,172 24,887 $ 45,774 $ 65,679
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 $ 8,172      
Comprehensive loss   $ 24,887