Supplemental Guarantor Information (Income and Comprehensive Income) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	$ 0	$ 0	$ 0	$ 0
Sales - third party	284,184,000	301,361,000	564,975,000	555,088,000
Net sales	284,184,000	301,361,000	564,975,000	555,088,000
Cost of sales	266,231,000	252,440,000	521,328,000	457,617,000
Gross profit	17,953,000	48,921,000	43,647,000	97,471,000
Research and development	2,903,000	2,787,000	5,673,000	5,880,000
Selling and administrative expenses	32,137,000	30,161,000	62,044,000	59,874,000
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment	121570		121570
Restructuring and Related Cost, Incurred Cost	831,000	0	917,000	0
Operating income	(139,488,000)	15,973,000	(146,557,000)	31,717,000
Equity in earnings of, and gain recorded on acquisition of, non-consolidated affiliate	0	0	0	0
Other (income) expense, net	(41,000)	975,000	753,000	1,525,000
Interest expense - affiliate	0	0	0	0
Interest expense - third party	9,155,000	8,947,000	18,154,000	17,955,000
Interest income - affiliate	0	0	0	0
Interest income	(55,000)	(49,000)	(113,000)	(113,000)
Income before provision for income taxes	(148,547,000)	6,100,000	(165,351,000)	12,350,000
(Benefit) provision for income taxes	6,886,000	1,718,000	1,599,000	3,758,000
Net income	(155,433,000)	4,382,000	(166,950,000)	8,592,000
Statements of Comprehensive Income
Net income	(155,433,000)	4,382,000	(166,950,000)	8,592,000
Foreign currency translation	(240,000)	(9,823,000)	2,147,000	(17,132,000)
Commodities and foreign currency derivatives	479,000	(3,326,000)	164,000	207,000
Other comprehensive income (loss), net of tax:	239,000	(13,149,000)	2,311,000	(16,925,000)
Comprehensive income	(155,194,000)	(8,767,000)	(164,639,000)	(8,333,000)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	0	0	0	0
Sales - third party	0	0	0	0
Net sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Research and development	0	0	0	0
Selling and administrative expenses	0	0	0	0
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment	0		0
Restructuring and Related Cost, Incurred Cost	0		0
Operating income	0	0	0	0
Equity in earnings of, and gain recorded on acquisition of, non-consolidated affiliate	150,446,000	(9,085,000)	157,018,000	(18,056,000)
Other (income) expense, net	0	0	0	0
Interest expense - affiliate	0	0	0	0
Interest expense - third party	8,003,000	7,799,000	15,955,000	15,544,000
Interest income - affiliate	(210,000)	(346,000)	(436,000)	(710,000)
Interest income	0	0	0	0
Income before provision for income taxes	(7,793,000)	(7,453,000)	(15,519,000)	(14,834,000)
(Benefit) provision for income taxes	(2,806,000)	(2,750,000)	(5,587,000)	(5,370,000)
Net income	(155,433,000)	4,382,000	(166,950,000)	8,592,000
Statements of Comprehensive Income
Net income	(155,433,000)	4,382,000	(166,950,000)	8,592,000
Other comprehensive income (loss), net of tax:	239,000	(13,149,000)	2,311,000	(16,925,000)
Comprehensive income	(155,194,000)	(8,767,000)	(164,639,000)	(8,333,000)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	53,959,000	52,679,000	124,316,000	97,946,000
Sales - third party	110,806,000	127,592,000	221,930,000	225,788,000
Net sales	164,765,000	180,271,000	346,246,000	323,734,000
Cost of sales	157,447,000	152,517,000	314,476,000	275,343,000
Gross profit	7,318,000	27,754,000	31,770,000	48,391,000
Research and development	2,903,000	2,787,000	5,673,000	5,880,000
Selling and administrative expenses	14,265,000	10,588,000	24,132,000	23,082,000
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment	121570		121570
Restructuring and Related Cost, Incurred Cost	16,000		52,000
Operating income	(131,436,000)	14,379,000	(119,657,000)	19,429,000
Equity in earnings of, and gain recorded on acquisition of, non-consolidated affiliate	8,051,000	12,000	20,060,000	(6,411,000)
Other (income) expense, net	(4,000)	671,000	820,000	714,000
Interest expense - affiliate	210,000	434,000	436,000	833,000
Interest expense - third party	906,000	790,000	1,646,000	1,595,000
Interest income - affiliate	0	(188,000)	0	(376,000)
Interest income	0	0	0	0
Income before provision for income taxes	(132,548,000)	12,672,000	(122,559,000)	16,663,000
(Benefit) provision for income taxes	9,847,000	3,575,000	14,399,000	5,018,000
Net income	(150,446,000)	9,085,000	(157,018,000)	18,056,000
Statements of Comprehensive Income
Net income	(150,446,000)	9,085,000	(157,018,000)	18,056,000
Other comprehensive income (loss), net of tax:	239,000	(13,149,000)	2,311,000	(16,925,000)
Comprehensive income	(150,207,000)	(4,064,000)	(154,707,000)	1,131,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	33,364,000	36,487,000	68,571,000	72,639,000
Sales - third party	173,378,000	173,769,000	343,045,000	329,300,000
Net sales	206,742,000	210,256,000	411,616,000	401,939,000
Cost of sales	196,107,000	189,089,000	399,739,000	352,859,000
Gross profit	10,635,000	21,167,000	11,877,000	49,080,000
Research and development	0	0	0	0
Selling and administrative expenses	17,872,000	19,573,000	37,912,000	36,792,000
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment	0		0
Restructuring and Related Cost, Incurred Cost	815,000		865,000
Operating income	(8,052,000)	1,594,000	(26,900,000)	12,288,000
Equity in earnings of, and gain recorded on acquisition of, non-consolidated affiliate	0	0	0	0
Other (income) expense, net	(37,000)	304,000	(67,000)	811,000
Interest expense - affiliate	0	188,000	0	376,000
Interest expense - third party	246,000	358,000	553,000	816,000
Interest income - affiliate	0	(88,000)	0	(123,000)
Interest income	(55,000)	(49,000)	(113,000)	(113,000)
Income before provision for income taxes	(8,206,000)	881,000	(27,273,000)	10,521,000
(Benefit) provision for income taxes	(155,000)	893,000	(7,213,000)	4,110,000
Net income	(8,051,000)	(12,000)	(20,060,000)	6,411,000
Statements of Comprehensive Income
Net income	(8,051,000)	(12,000)	(20,060,000)	6,411,000
Other comprehensive income (loss), net of tax:	45,000	(11,757,000)	2,522,000	(16,108,000)
Comprehensive income	(8,006,000)	(11,769,000)	(17,538,000)	(9,697,000)
Consolidating Entries and Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Sales - affiliates	(87,323,000)	(89,166,000)	(192,887,000)	(170,585,000)
Sales - third party	0	0	0	0
Net sales	(87,323,000)	(89,166,000)	(192,887,000)	(170,585,000)
Cost of sales	(87,323,000)	(89,166,000)	(192,887,000)	(170,585,000)
Gross profit	0	0	0	0
Research and development	0	0	0	0
Selling and administrative expenses	0	0	0	0
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment	0		0
Restructuring and Related Cost, Incurred Cost	0		0
Operating income	0	0	0	0
Equity in earnings of, and gain recorded on acquisition of, non-consolidated affiliate	(158,497,000)	9,073,000	(177,078,000)	24,467,000
Other (income) expense, net	0	0	0	0
Interest expense - affiliate	(210,000)	(622,000)	(436,000)	(1,209,000)
Interest expense - third party	0	0	0	0
Interest income - affiliate	210,000	622,000	436,000	1,209,000
Interest income	0	0	0	0
Income before provision for income taxes	0	0	0	0
(Benefit) provision for income taxes	0	0	0	0
Net income	158,497,000	(9,073,000)	177,078,000	(24,467,000)
Statements of Comprehensive Income
Net income	158,497,000	(9,073,000)	177,078,000	(24,467,000)
Other comprehensive income (loss), net of tax:	(284,000)	24,906,000	(4,833,000)	33,033,000
Comprehensive income	$ 158,213,000	$ 15,833,000	$ 172,245,000	$ 8,566,000