CONSOLIDATED STATEMENTS OF EQUITY - USD ($)	Total	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Preferred Stock [Member] Preferred Stock [Member]	Common Class A [Member] Common Stock [Member]	Common Class B [Member]	Common Class B [Member] Common Stock [Member]	Warrant [Member] Common Stock [Member]	2018 Warrants [Member]
BALANCE at Dec. 31, 2015	$ 78,641,000	$ 1,914,050,000	$ (1,605,245,000)	$ (242,409,000)	$ 1,381,000	$ 0	$ 10,864,000		$ 0
BALANCE (in shares) at Dec. 31, 2015						1
BALANCE (in shares) at Dec. 31, 2015							135,804,221		0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	3,510,000	3,510,000
Preferred dividend paid in kind	(13,701,000)	13,701,000
Share issuance, stock-based compensation	0	(52,000)					$ (52,000)
Payments of withholding tax on net share settlement of stock-based compensation	0
Share issuance, stock-based compensation (in shares)							648,737
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(180,597,000)		(180,291,000)		(306,000)
Gain / (loss) on derivative instruments (Note 14)	(3,031,000)			(3,031,000)
Currency translation adjustment	1,649,000			1,452,000	197,000
BALANCE at Dec. 31, 2016	(106,532,000)	1,910,244,000	(1,785,536,000)	(243,988,000)	1,272,000	$ 0	$ 11,476,000		$ 0
BALANCE (in shares) at Dec. 31, 2016						1
BALANCE (in shares) at Dec. 31, 2016							143,449,913		0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	4,412,000	4,412,000
Number of Warrants Exercised											1,148,469
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants										$ 92,000
Adjustments to Additional Paid in Capital, Warrant Issued	1,148,000	1,056,000
Preferred dividend paid in kind	(9,694,000)	9,694,000
Share issuance, stock-based compensation	0	(71,000)					$ (71,000)
Payments of withholding tax on net share settlement of stock-based compensation	(168,000)
Share issuance, stock-based compensation (in shares)							888,115
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	49,427,000		49,768,000		(341,000)
Gain / (loss) on derivative instruments (Note 14)	1,269,000			1,269,000
Currency translation adjustment	54,368,000			55,281,000	(913,000)
BALANCE at Dec. 31, 2017	(5,770,000)	1,905,779,000	(1,735,768,000)	(187,438,000)	18,000	$ 0	$ 11,639,000		$ 0
BALANCE (in shares) at Dec. 31, 2017						1
BALANCE (in shares) at Dec. 31, 2017							145,486,497	0	0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	7,083,000	7,083,000
Number of Warrants Exercised											105,652,401
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants										$ 8,452,000
Adjustments to Additional Paid in Capital, Warrant Issued	105,652,000	97,200,000
Preferred dividend paid in kind	(4,777,000)	4,777,000
Share issuance, stock-based compensation	0	(137,000)					$ (137,000)
Payments of withholding tax on net share settlement of stock-based compensation	(1,630,000)	1,630,000
Share issuance, stock-based compensation (in shares)							1,714,656
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	157,613,000		157,692,000		(79,000)
Gain / (loss) on derivative instruments (Note 14)	(5,800,000)			(5,800,000)
Currency translation adjustment	(23,050,000)			(23,412,000)	362,000
BALANCE at Dec. 31, 2018	$ 229,321,000	$ 2,003,518,000	$ (1,578,076,000)	$ (216,650,000)	$ 301,000	$ 0	$ 20,228,000		$ 0
BALANCE (in shares) at Dec. 31, 2018						1
BALANCE (in shares) at Dec. 31, 2018							252,853,554	0	0