GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION Cash flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash generated from / (used in) continuing operating activities	$ 85,877	$ (65,242)	$ (61,070)
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Purchase of property, plant and equipment	(33,517)	(28,685)	(30,118)
Disposal of property, plant and equipment	3,091	137	283
Proceeds From Intercompany Investing Activities	0	0
Payments for Intercompany Investing Activities	0	0	0
Proceeds From (Payments For) Intercompany Investing Activities			0
Net cash used in continuing investing activities	(30,426)	(28,548)	(29,835)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Repayments of Senior Debt	(261,034)	(712,919)	(310,322)
Debt transactions costs	(1,541)	(14,206)	(785)
Issuance of debt	253,051	550,421	0
Change in restricted cash	0	0	20,605
Proceeds from credit facilities	0	25,000	40
Payment of credit facilities and capital leases	(27,365)	(1,080)	(1,648)
Issuance of common stock	0	191,825	157,116
Settlement of forward currency swaps	7,983	0	0
Issuance of preferred stock	0	0	200,000
Equity issuance costs	0	0	(5,410)
Other	0	(46)	(352)
Proceeds From Intercompany Financing Activities	0	0	0
Payments For Intercompany Financing Activities	0	0	0
Net cash (used in) / provided by continuing financing activities	(28,906)	38,995	59,244
Net cash used in discontinued operations - operating activities	(3,019)	(1,408)	(1,952)
Net cash provided by / (used in) discontinued operations - investing activities	6,598	(228)	(301)
Net cash (used in) / provided by discontinued operations - financing activities	(76)	(942)	77
Impact of exchange rate fluctuations on cash and cash equivalents	(2,667)	(10,651)	(384)
Net increase / (decrease) in cash and cash equivalents	27,381	(68,024)	(34,221)
Cash and cash equivalents	61,679	34,298	102,322	$ 136,543
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash generated from / (used in) continuing operating activities	46,196	67,171	(80,304)
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Purchase of property, plant and equipment	0	0	0
Disposal of property, plant and equipment	0	0	0
Proceeds From Intercompany Investing Activities	380,319	703,941
Payments for Intercompany Investing Activities	(396,003)	(900,009)	(580,533)
Proceeds From (Payments For) Intercompany Investing Activities			609,801
Net cash used in continuing investing activities	(15,684)	(196,068)	29,268
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Repayments of Senior Debt	(261,034)	(400,673)	(310,322)
Debt transactions costs	(1,541)	(12,396)	(785)
Issuance of debt	253,051	550,421
Change in restricted cash			20,467
Proceeds from credit facilities		25,000	0
Payment of credit facilities and capital leases	(26,117)	0	0
Issuance of common stock		191,825	157,116
Settlement of forward currency swaps	7,983
Issuance of preferred stock			200,000
Equity issuance costs			(5,410)
Other		0	59
Proceeds From Intercompany Financing Activities	22,707	0	0
Payments For Intercompany Financing Activities	(16,901)	(243,778)	0
Net cash (used in) / provided by continuing financing activities	(21,852)	110,399	61,125
Net cash used in discontinued operations - operating activities	0	(350)	0
Net cash provided by / (used in) discontinued operations - investing activities	0	0	0
Net cash (used in) / provided by discontinued operations - financing activities	0	0	0
Impact of exchange rate fluctuations on cash and cash equivalents	0	0	0
Net increase / (decrease) in cash and cash equivalents	8,660	(18,848)	10,089
Cash and cash equivalents	9,273	613	19,461	9,372
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash generated from / (used in) continuing operating activities	(84,922)	(132,570)	288,651
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Purchase of property, plant and equipment	0	0	0
Disposal of property, plant and equipment	0	0	0
Proceeds From Intercompany Investing Activities	110,377	356,217
Payments for Intercompany Investing Activities	(53,127)	(418,504)	(266,355)
Proceeds From (Payments For) Intercompany Investing Activities			9,323
Net cash used in continuing investing activities	57,250	(62,287)	(257,032)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Repayments of Senior Debt	0	0	0
Debt transactions costs	0	0	0
Issuance of debt	0	0
Change in restricted cash			0
Proceeds from credit facilities		0	0
Payment of credit facilities and capital leases	0	0	0
Issuance of common stock		0	0
Settlement of forward currency swaps	0
Issuance of preferred stock			0
Equity issuance costs			0
Other		0	0
Proceeds From Intercompany Financing Activities	132,090	634,862	580,533
Payments For Intercompany Financing Activities	(108,093)	(443,412)	(609,801)
Net cash (used in) / provided by continuing financing activities	23,997	191,450	(29,268)
Net cash used in discontinued operations - operating activities	0	0	0
Net cash provided by / (used in) discontinued operations - investing activities	3,779	0	0
Net cash (used in) / provided by discontinued operations - financing activities	0	0	0
Impact of exchange rate fluctuations on cash and cash equivalents	(2,917)	916	235
Net increase / (decrease) in cash and cash equivalents	(2,813)	(2,491)	2,586
Cash and cash equivalents	118	2,931	5,422	2,836
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash generated from / (used in) continuing operating activities	130,622	157	(269,417)
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Purchase of property, plant and equipment	(33,517)	(28,685)	(30,118)
Disposal of property, plant and equipment	3,091	137	283
Proceeds From Intercompany Investing Activities	7,780	0
Payments for Intercompany Investing Activities	(303,763)	(260,529)	0
Proceeds From (Payments For) Intercompany Investing Activities			0
Net cash used in continuing investing activities	(326,409)	(289,077)	(29,835)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Repayments of Senior Debt	0	(312,246)	0
Debt transactions costs	0	(1,810)	0
Issuance of debt	0	0
Change in restricted cash			138
Proceeds from credit facilities		0	40
Payment of credit facilities and capital leases	(1,248)	(1,080)	(1,648)
Issuance of common stock		0	0
Settlement of forward currency swaps	0
Issuance of preferred stock			0
Equity issuance costs			0
Other		(46)	(411)
Proceeds From Intercompany Financing Activities	328,783	720,248	266,355
Payments For Intercompany Financing Activities	(110,188)	(149,036)	(9,323)
Net cash (used in) / provided by continuing financing activities	217,347	256,030	255,151
Net cash used in discontinued operations - operating activities	(3,019)	(1,058)	(1,952)
Net cash provided by / (used in) discontinued operations - investing activities	2,819	(228)	(301)
Net cash (used in) / provided by discontinued operations - financing activities	(76)	(942)	77
Impact of exchange rate fluctuations on cash and cash equivalents	250	(11,567)	(619)
Net increase / (decrease) in cash and cash equivalents	21,534	(46,685)	(46,896)
Cash and cash equivalents	52,288	30,754	77,439	124,335
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash generated from / (used in) continuing operating activities	(6,019)	0	0
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]
Purchase of property, plant and equipment	0	0	0
Disposal of property, plant and equipment	0	0	0
Proceeds From Intercompany Investing Activities	(498,476)	(1,060,158)
Payments for Intercompany Investing Activities	752,893	1,579,042	846,888
Proceeds From (Payments For) Intercompany Investing Activities			(619,124)
Net cash used in continuing investing activities	254,417	518,884	227,764
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]
Repayments of Senior Debt	0	0	0
Debt transactions costs	0	0	0
Issuance of debt	0	0
Change in restricted cash			0
Proceeds from credit facilities		0	0
Payment of credit facilities and capital leases	0	0	0
Issuance of common stock		0	0
Settlement of forward currency swaps	0
Issuance of preferred stock			0
Equity issuance costs			0
Other		0	0
Proceeds From Intercompany Financing Activities	(483,580)	(1,355,110)	(846,888)
Payments For Intercompany Financing Activities	235,182	836,226	619,124
Net cash (used in) / provided by continuing financing activities	(248,398)	(518,884)	(227,764)
Net cash used in discontinued operations - operating activities	0	0	0
Net cash provided by / (used in) discontinued operations - investing activities	0	0	0
Net cash (used in) / provided by discontinued operations - financing activities	0	0	0
Impact of exchange rate fluctuations on cash and cash equivalents	0	0	0
Net increase / (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents	$ 0	$ 0	$ 0	$ 0