CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]	Preferred Class A [Member] Series A Convertible Preferred Stock [Member]	Common Class A [Member] Common Stock [Member]	Warrant [Member] Common Stock [Member]	Common Class B [Member]	Common Class B [Member] Common Stock [Member]
BALANCE at Dec. 31, 2017	$ (5,770)	$ 1,905,779	$ (1,735,768)	$ (187,438)	$ 18	$ 0	$ 11,639			$ 0
BALANCE (in shares) at Dec. 31, 2017						1
BALANCE (in shares) at Dec. 31, 2017							145,486,497			0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	6,138	6,138
Shares issuance, stock-based compensation (in shares)							1,696,717
Share issuance, stock-based compensation	0	(136)					$ (136)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(1,630)	(1,630)
Net income	101,588		101,862		(274)
Unrealized (loss) / gain on derivative instruments (Note 14)	(1,895)			(1,895)
Currency translation adjustment	(10,707)			(10,985)	278
Currency translation adjustment	(10,707)
BALANCE at Sep. 30, 2018	188,599	2,002,574	(1,633,906)	(200,318)	22	$ 0	$ 20,227			$ 0
BALANCE (in shares) at Sep. 30, 2018						1
BALANCE (in shares) at Sep. 30, 2018							252,835,615			0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Number of Warrants Exercised								105,652,401
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants								$ 8,452
Adjustments to Additional Paid in Capital, Warrant Issued	105,652	97,200
Dividends, Preferred Stock, Paid-in-kind	(4,777)	(4,777)
BALANCE at Jun. 30, 2018	103,917	1,999,610	(1,702,477)	(213,434)	48	$ 0	$ 20,170			$ 0
BALANCE (in shares) at Jun. 30, 2018						1
BALANCE (in shares) at Jun. 30, 2018							252,121,007			0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	3,898	3,898
Shares issuance, stock-based compensation (in shares)							714,608
Share issuance, stock-based compensation	0	(57)					$ (57)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(877)	(877)
Net income	68,491		68,571		(80)
Unrealized (loss) / gain on derivative instruments (Note 14)	1,033			1,033
Currency translation adjustment	12,137			12,083	54
Currency translation adjustment	12,137
BALANCE at Sep. 30, 2018	188,599	2,002,574	(1,633,906)	(200,318)	22	$ 0	$ 20,227			$ 0
BALANCE (in shares) at Sep. 30, 2018						1
BALANCE (in shares) at Sep. 30, 2018							252,835,615			0
BALANCE at Dec. 31, 2018	229,321	2,003,518	(1,578,076)	(216,650)	301	$ 0	$ 20,228			$ 0
BALANCE (in shares) at Dec. 31, 2018						1
BALANCE (in shares) at Dec. 31, 2018							252,853,554		0	0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	3,059	3,059
Shares issuance, stock-based compensation (in shares)							753,472
Share issuance, stock-based compensation	0	(60)					$ (60)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(367)	(367)
Net income	69,351		69,462		(111)
Unrealized (loss) / gain on derivative instruments (Note 14)	(4,786)			(4,786)
Currency translation adjustment	(31,366)			(31,723)	357
Currency translation adjustment	(31,366)
BALANCE at Sep. 30, 2019	265,212	2,006,150	(1,508,614)	(253,159)	547	$ 0	$ 20,288			$ 0
BALANCE (in shares) at Sep. 30, 2019						1
BALANCE (in shares) at Sep. 30, 2019							253,607,026		0	0
BALANCE at Jun. 30, 2019	283,512	2,005,215	(1,522,359)	(220,088)	459	$ 0	$ 20,285			$ 0
BALANCE (in shares) at Jun. 30, 2019						1
BALANCE (in shares) at Jun. 30, 2019							253,559,298			0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stock-based compensation	932	932
Shares issuance, stock-based compensation (in shares)							47,728
Share issuance, stock-based compensation	0	(3)					$ (3)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(6)	6
Net income	13,522		13,745		(223)
Unrealized (loss) / gain on derivative instruments (Note 14)	(235)			(235)
Currency translation adjustment	(32,525)			(32,836)	311
Currency translation adjustment	(32,525)
BALANCE at Sep. 30, 2019	$ 265,212	$ 2,006,150	$ (1,508,614)	$ (253,159)	$ 547	$ 0	$ 20,288			$ 0
BALANCE (in shares) at Sep. 30, 2019						1
BALANCE (in shares) at Sep. 30, 2019							253,607,026		0	0