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, 2014	$ 277,182,000	$ 1,928,920,000	$ (1,490,344,000)	$ (169,609,000)	$ (2,612,000)	$ 0	$ 10,827,000		$ 0
BALANCE (in shares) at Dec. 31, 2014						1
BALANCE (in shares) at Dec. 31, 2014							135,335,258		0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	2,439,000	2,439,000
Preferred dividend paid in kind	(17,272,000)	17,272,000
Share issuance, stock-based compensation	0	(37,000)					$ (37,000)
Payments of withholding tax on net share settlement of share-based compensation	0
Share issuance, stock-based compensation (in shares)							468,963
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(115,572,000)		(114,901,000)		(671,000)
Gain / (loss) on derivative instruments (Note 14)	(839,000)			(839,000)
Gain / (loss) on derivative instruments (Note 14)	(839,000)
Currency translation adjustment	(89,714,000)			(91,097,000)	1,383,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax	22,417,000			19,136,000	3,281,000
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
Number of Warrants Exercised											6,996,955
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants										$ 560,000
Adjustments to Additional Paid in Capital, Warrant Issued	6,997,000	6,437,000
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 share-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)
Gain / (loss) on derivative instruments (Note 14)	(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	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 share-based compensation	(168,000)	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
Gain / (loss) on derivative instruments (Note 14)	(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