Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 154,323	$ 190,960
Accounts receivable, net of allowance for doubtful accounts and customer deductions of $12,118 and $10,567 as of September 30, 2014, and December 31, 2013, respectively	717,947	643,083
Inventories	616,962	594,291
Prepaid expenses and other current assets	76,195	32,101
Federal and state income taxes receivable	0	22,958
Deferred income taxes	32,280	47,616
Total current assets	1,597,707	1,531,009
Property, plant, and equipment, net	2,818,133	2,805,704
Goodwill	541,911	526,789
Intangible assets, net	299,096	310,539
Other long-term assets	73,902	69,738
Total assets	5,330,749	5,243,779
Current liabilities:
Current maturities of long-term debt	6,500	39,000
Capital lease obligations	1,082	1,030
Accounts payable	387,854	357,432
Dividends payable	39,393	39,297
Federal and state income taxes payable	7,176	0
Accrued liabilities	228,758	214,058
Accrued interest	19,272	9,722
Total current liabilities	690,035	660,539
Long-term liabilities:
Long-term debt	2,350,484	2,508,845
Capital lease obligations	23,055	23,874
Deferred income taxes	426,086	434,835
Pension and postretirement benefit plans	204,286	193,548
Other long-term liabilities	84,764	65,318
Total long-term liabilities	3,088,675	3,226,420
Commitments and contingent liabilities
Stockholders' equity:
Common stock, par value $0.01 per share, 300,000 shares authorized, 98,383 and 98,172 shares issued as of September 30, 2014, and December 31, 2013, respectively	984	982
Additional paid in capital	427,844	401,761
Retained earnings	1,184,155	1,019,101
Accumulated other comprehensive loss	(60,944)	(65,024)
Total stockholders' equity	1,552,039	1,356,820
Total liabilities and stockholders' equity	$ 5,330,749	$ 5,243,779