Supplemental Guarantor and Non-Guarantor Financial Information (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental guarantor and non-guarantor financial information
Cash flows provided by (used in) operating activities	$ (139,704)	$ (27,076)	$ 329,907
INVESTING ACTIVITIES
Additions to property, plant and equipment	(92,999)	(153,896)	(391,512)
Proceeds from sales of investments	0	1,559	13,239
Proceeds from sale of property, plant and equipment	30,112	0	0
Intercompany loans made	0	0	0
Intercompany loans received	0	0	0
Investments in equity affiliates			0
Distributions from equity affiliates			0
Other	488	1,824	898
Cash flows used in investing activities	(62,399)	(150,513)	(377,375)
FINANCING ACTIVITIES
Proceeds from issuance of debt	869,800	897,412	496,510
Borrowings under revolving credit agreement			510,650
Repayments on revolving credit agreement			(519,453)
Retirements of debt	(427,165)	(515,195)	(392,851)
Dividends paid	(2,625)	(16,889)	(31,246)
Tax effect from stock-based compensation arrangements	0	(717)	217
Cash paid upon exercise of warrants	0	0	(11,535)
Debt issuance costs	(27,748)	(41,588)	(24,532)
Advances from (to) consolidated entities	0	0	0
Intercompany notes borrowings	0	0	0
Intercompany notes payments	0	0	0
Proceeds from stock-options exercised	108	279	161
Investment from Parent			0
Intercompany dividends			0
Other	(303)	(293)	(766)
Cash flows provided by financing activities	412,067	323,009	27,155
Cash flows provided by (used in) continuing operations	209,964	145,420	(20,313)
CASH FLOWS FROM DISCONTINUED OPERATIONS
Cash flows provided by investing activities	0	0	9,500
Cash flows provided by discontinued operations			9,500
Effect of foreign exchange rates on cash	(2,250)	(1,203)	(1,016)
Net increase (decrease) in cash and cash equivalents	207,714	144,217	(11,829)
Cash and cash equivalents at beginning of year	260,818	116,601	128,430
Cash and cash equivalents at end of year	468,532	260,818	116,601
Parent (Issuer)
Supplemental guarantor and non-guarantor financial information
Cash flows provided by (used in) operating activities	(179,786)	(204,982)	(373,256)
INVESTING ACTIVITIES
Additions to property, plant and equipment	(3,279)	(2,294)	(4,395)
Proceeds from sales of investments		0	0
Proceeds from sale of property, plant and equipment	(44)
Intercompany loans made	(5,200)	(40,236)	(293,170)
Intercompany loans received	1,828	30,500	16,513
Investments in equity affiliates			(238,083)
Distributions from equity affiliates			271,847
Other	0	0	0
Cash flows used in investing activities	(6,695)	(12,030)	(247,288)
FINANCING ACTIVITIES
Proceeds from issuance of debt	869,800	897,412	496,510
Borrowings under revolving credit agreement			0
Repayments on revolving credit agreement			0
Retirements of debt	(411,766)	(496,062)	(343,255)
Dividends paid	(2,625)	(16,889)	(31,246)
Tax effect from stock-based compensation arrangements		(717)	217
Cash paid upon exercise of warrants			(11,535)
Debt issuance costs	(27,748)	(41,588)	(24,532)
Advances from (to) consolidated entities	(53,602)	25,072	519,737
Intercompany notes borrowings	0	0	0
Intercompany notes payments	0	0	0
Proceeds from stock-options exercised	108	279	161
Investment from Parent			0
Intercompany dividends			0
Other	(303)	(178)	(766)
Cash flows provided by financing activities	373,864	367,329	605,291
Cash flows provided by (used in) continuing operations			(15,253)
CASH FLOWS FROM DISCONTINUED OPERATIONS
Cash flows provided by investing activities			0
Cash flows provided by discontinued operations			0
Effect of foreign exchange rates on cash	0	0	0
Net increase (decrease) in cash and cash equivalents	187,383	150,317	(15,253)
Cash and cash equivalents at beginning of year	234,150	83,833	99,086
Cash and cash equivalents at end of year	421,533	234,150	83,833
Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Cash flows provided by (used in) operating activities	53,037	246,428	742,100
INVESTING ACTIVITIES
Additions to property, plant and equipment	(82,889)	(130,061)	(157,833)
Proceeds from sales of investments		0	0
Proceeds from sale of property, plant and equipment	30,156
Intercompany loans made	0	0	0
Intercompany loans received	0	0	0
Investments in equity affiliates			0
Distributions from equity affiliates			0
Other	0	0	855
Cash flows used in investing activities	(52,733)	(130,061)	(156,978)
FINANCING ACTIVITIES
Proceeds from issuance of debt	0	0	0
Borrowings under revolving credit agreement			0
Repayments on revolving credit agreement			0
Retirements of debt	(7,626)	(11,840)	(12,140)
Dividends paid	0	0	0
Tax effect from stock-based compensation arrangements		0	0
Cash paid upon exercise of warrants			0
Debt issuance costs	0	0	0
Advances from (to) consolidated entities	6,812	(97,311)	(568,099)
Intercompany notes borrowings	0	0	8,499
Intercompany notes payments	0	(13,639)	0
Proceeds from stock-options exercised	0	0	0
Investment from Parent			238,083
Intercompany dividends			(261,102)
Other	7	(115)	0
Cash flows provided by financing activities	(807)	(122,905)	(594,759)
Cash flows provided by (used in) continuing operations			(9,637)
CASH FLOWS FROM DISCONTINUED OPERATIONS
Cash flows provided by investing activities			9,500
Cash flows provided by discontinued operations			9,500
Effect of foreign exchange rates on cash	0	0	0
Net increase (decrease) in cash and cash equivalents	(503)	(6,538)	(137)
Cash and cash equivalents at beginning of year	1,620	8,158	8,295
Cash and cash equivalents at end of year	1,117	1,620	8,158
Non-Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Cash flows provided by (used in) operating activities	(12,955)	(68,522)	(38,937)
INVESTING ACTIVITIES
Additions to property, plant and equipment	(6,831)	(21,541)	(229,284)
Proceeds from sales of investments		1,559	13,239
Proceeds from sale of property, plant and equipment	0
Intercompany loans made	0	0	0
Intercompany loans received	0	0	0
Investments in equity affiliates			0
Distributions from equity affiliates			0
Other	488	1,824	43
Cash flows used in investing activities	(6,343)	(18,158)	(216,002)
FINANCING ACTIVITIES
Proceeds from issuance of debt	0	0	0
Borrowings under revolving credit agreement			510,650
Repayments on revolving credit agreement			(519,453)
Retirements of debt	(7,773)	(7,293)	(37,456)
Dividends paid	0	0	0
Tax effect from stock-based compensation arrangements		0	0
Cash paid upon exercise of warrants			0
Debt issuance costs	0	0	0
Advances from (to) consolidated entities	46,790	72,239	48,362
Intercompany notes borrowings	5,200	40,236	284,671
Intercompany notes payments	(1,828)	(16,861)	(16,513)
Proceeds from stock-options exercised	0	0	0
Investment from Parent			0
Intercompany dividends			(10,745)
Other	(7)	0	0
Cash flows provided by financing activities	42,382	88,321	259,516
Cash flows provided by (used in) continuing operations			4,577
CASH FLOWS FROM DISCONTINUED OPERATIONS
Cash flows provided by investing activities			0
Cash flows provided by discontinued operations			0
Effect of foreign exchange rates on cash	(2,250)	(1,203)	(1,016)
Net increase (decrease) in cash and cash equivalents	20,834	438	3,561
Cash and cash equivalents at beginning of year	25,048	24,610	21,049
Cash and cash equivalents at end of year	45,882	25,048	24,610
Eliminations
Supplemental guarantor and non-guarantor financial information
Cash flows provided by (used in) operating activities	0	0	0
INVESTING ACTIVITIES
Additions to property, plant and equipment	0	0	0
Proceeds from sales of investments		0	0
Proceeds from sale of property, plant and equipment	0
Intercompany loans made	5,200	40,236	293,170
Intercompany loans received	(1,828)	(30,500)	(16,513)
Investments in equity affiliates			238,083
Distributions from equity affiliates			(271,847)
Other	0	0	0
Cash flows used in investing activities	3,372	9,736	242,893
FINANCING ACTIVITIES
Proceeds from issuance of debt	0	0	0
Borrowings under revolving credit agreement			0
Repayments on revolving credit agreement			0
Retirements of debt	0	0	0
Dividends paid	0	0	0
Tax effect from stock-based compensation arrangements		0	0
Cash paid upon exercise of warrants			0
Debt issuance costs	0	0	0
Advances from (to) consolidated entities	0	0	0
Intercompany notes borrowings	(5,200)	(40,236)	(293,170)
Intercompany notes payments	1,828	30,500	16,513
Proceeds from stock-options exercised	0	0	0
Investment from Parent			(238,083)
Intercompany dividends			271,847
Other	0	0	0
Cash flows provided by financing activities	(3,372)	(9,736)	(242,893)
Cash flows provided by (used in) continuing operations			0
CASH FLOWS FROM DISCONTINUED OPERATIONS
Cash flows provided by investing activities			0
Cash flows provided by discontinued operations			0
Effect of foreign exchange rates on cash	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	$ 0	$ 0	$ 0