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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) $ (29,888) $ (39,822) $ (69,697) $ (135,657)
Currency translation difference on related borrowings 185 (307) 268 195
Currency translation difference on foreign currency net investments 686 (2,228) 1,449 (3,766)
Other Comprehensive Income (Loss), Net of Tax 871 (2,535) 1,717 (3,571)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (29,017)      
Comprehensive loss (29,017) (42,357) (67,980) (139,228)
Parent [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (29,888) (39,824) (69,696) (135,657)
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 (29,888)      
Comprehensive loss   (39,824)    
Guarantor [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (8,698) (16,502) (24,287) (30,816)
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 (8,698)      
Comprehensive loss   (16,502)    
Non-Guarantor [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) (7,125) (8,064) (13,316) (9,977)
Currency translation difference on related borrowings 185 (307)    
Currency translation difference on foreign currency net investments 686 (2,228)    
Other Comprehensive Income (Loss), Net of Tax 871 (2,535)    
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (6,254)      
Comprehensive loss   (10,599)    
Consolidation, Eliminations [Member]        
Schedule of Condensed Statement of Comprehensive Income [Line Items]        
Net income (loss) 15,823 24,568 $ 37,602 $ 40,793
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 $ 15,823      
Comprehensive loss   $ 24,568