CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income	$ 245,193us-gaap_NetIncomeLoss	$ 166,895us-gaap_NetIncomeLoss	$ 274,436us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other non-cash charges	233,940	215,812	214,153
Stock-based compensation expense	9,074us-gaap_ShareBasedCompensation	8,177us-gaap_ShareBasedCompensation	7,860us-gaap_ShareBasedCompensation
Loss on disposition of assets, net	15,472us-gaap_GainLossOnDispositionOfAssets	9,371us-gaap_GainLossOnDispositionOfAssets	6,099us-gaap_GainLossOnDispositionOfAssets
Deferred income tax provision (benefit)	12,354us-gaap_DeferredIncomeTaxExpenseBenefit	(13,060)us-gaap_DeferredIncomeTaxExpenseBenefit	4,821us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits for share-based payments	(4,336)	(3,178)	(2,724)
(Increase) decrease in assets:
Accounts receivable	(198,021)	(49,959)	73,809
Income taxes receivable	(19,059)	1,692	9,295
Inventories	(29,708)us-gaap_IncreaseDecreaseInInventories	14,078us-gaap_IncreaseDecreaseInInventories	(40,354)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	2	1,519	(2,284)
Other current assets	(749)	1,114	26,189
Other non-current assets	(2,238)	(1,881)	(6,415)
Increase (decrease) in liabilities:
Accounts payable	36,421	14,062	(4,929)
Income taxes payable	944	(6,428)	(4,277)
Accrued payroll and related expenses	13,221	4,585	(1,627)
Accrued insurance expenses	(440)	(80)	408
Accrued state, local and other taxes	1,819	(2,324)	2,260
Other accrued expenses	(775)	(1,548)	1,412
Pension liabilities	2,219	3,183	(589)
Long-term accrued insurance expenses	(126)	(175)	1,400
Other long-term liabilities	7,550	3,769	990
Net cash provided by operating activities	322,757	365,624	559,933
INVESTING ACTIVITIES
Capital expenditures	(371,502)	(201,681)	(328,936)
Proceeds from sale of assets	18,707	11,071	19,309
Purchase of business		(17,044)
Increased ownership interest in subsidiary			(6,211)
Investment in joint venture	(2,554)
Net cash used for investing activities	(355,349)	(207,654)	(315,838)
FINANCING ACTIVITIES
Payment of dividends	(91,608)us-gaap_PaymentsOfDividends	(87,789)us-gaap_PaymentsOfDividends	(114,069)us-gaap_PaymentsOfDividends
Borrowings from notes payable to banks	1,168,100us-gaap_ProceedsFromNotesPayable	686,700us-gaap_ProceedsFromNotesPayable	844,050us-gaap_ProceedsFromNotesPayable
Repayments of notes payable to banks	(996,900)us-gaap_RepaymentsOfNotesPayable	(740,400)us-gaap_RepaymentsOfNotesPayable	(940,350)us-gaap_RepaymentsOfNotesPayable
Debt issue costs for notes payable to banks	(667)us-gaap_PaymentsOfDebtIssuanceCosts
Excess tax benefits for share-based payments	4,336	3,178	2,724
Cash paid for common stock purchased and retired	(49,597)	(25,122)	(30,224)
Proceeds received upon exercise of stock options			544
Net cash provided by (used for) financing activities	33,664	(163,433)	(237,325)
Net increase (decrease) in cash and cash equivalents	1,072	(5,463)	6,770
Cash and cash equivalents at beginning of year	8,700	14,163	7,393
Cash and cash equivalents at end of year	$ 9,772	$ 8,700	$ 14,163

The current period expense charged against earnings on long-lived, physical and intangible assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their estimated useful lives or period of benefit of such assets; and other transactions that do not result in cash inflows or outflows in the period in which they occur, but affect net income for which there is not a more specific and appropriate element.

No definition available.