Segment Information (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Operating income (loss)
Corporate SG & A	$ (73,463,000)	$ (65,356,000)	$ (143,505,000)	$ (130,618,000)
Profit sharing	(10,469,000)	(4,779,000)	(15,864,000)	(11,422,000)
Operating income	131,905,000	69,198,000	212,837,000	165,430,000
Assets
Cash and equivalents	357,490,000	243,753,000	357,490,000	243,753,000	342,919,000	395,156,000	477,861,000	375,917,000
Accounts receivable	852,440,000		852,440,000			664,208,000
Inventories	1,320,871,000		1,320,871,000			1,314,747,000
Deferred income taxes	17,813,000		17,813,000			17,964,000
Property, plant and equipment, net	2,177,007,000		2,177,007,000			2,226,134,000
Other	76,439,000		76,439,000			115,083,000
Total assets	5,985,202,000	5,735,910,000	5,985,202,000	5,735,910,000		5,933,006,000
Liabilities
Accounts payable	440,691,000		440,691,000			414,932,000
Income taxes payable	19,448,000		19,448,000			4,023,000
Accrued interest	30,682,000		30,682,000			31,363,000
Deferred income taxes	548,285,000		548,285,000			556,038,000
Liabilities	3,025,992,000	3,220,439,000	3,025,992,000	3,220,439,000
Operating Segments [Member] | Corporate And Other [Member]
Operating income (loss)
Corporate SG & A	(11,000,000)	(9,100,000)	(19,300,000)	(17,100,000)
Company-wide equity- based compensation	(4,700,000)	(2,000,000)	(9,300,000)	(5,200,000)
Profit sharing	(8,900,000)	(3,200,000)	(13,600,000)	(9,100,000)
Other, net	400,000	(100,000)	1,500,000	500,000
Operating income	(24,159,000)	(14,434,000)	(40,704,000)	(30,873,000)
Assets
Cash and equivalents	299,900,000	218,200,000	299,900,000	218,200,000
Accounts receivable	14,400,000	13,600,000	14,400,000	13,600,000
Inventories	12,400,000	15,500,000	12,400,000	15,500,000
Deferred income taxes	17,700,000	23,600,000	17,700,000	23,600,000
Property, plant and equipment, net	70,900,000	73,700,000	70,900,000	73,700,000
Debt issuance costs, net	22,900,000	29,300,000	22,900,000	29,300,000
Intra-company debt	158,100,000	154,200,000	158,100,000	154,200,000
Other	28,200,000	76,100,000	28,200,000	76,100,000
Total assets	624,518,000	604,195,000	624,518,000	604,195,000
Liabilities
Accounts payable	46,000,000	43,500,000	46,000,000	43,500,000
Income taxes payable	19,400,000	2,900,000	19,400,000	2,900,000
Accrued interest	30,500,000	32,300,000	30,500,000	32,300,000
Accrued profit sharing	13,600,000	9,200,000	13,600,000	9,200,000
Debt	1,737,000,000	2,045,300,000	1,737,000,000	2,045,300,000
Deferred income taxes	120,500,000	205,100,000	120,500,000	205,100,000
Other	29,300,000	24,400,000	29,300,000	24,400,000
Liabilities	$ 1,996,306,000	$ 2,362,721,000	$ 1,996,306,000	$ 2,362,721,000