CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income	$ 61,318	$ 26,954
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	73,985	72,822
Equity-based compensation	8,405	8,543
Deferred income taxes	17,087	16,717
(Gain) loss on disposal of assets	(18)	4,985
Changes in certain assets and liabilities:
Accounts receivable	(75,596)	133,084
Inventories	82,567	164,999
Other assets	746	4,508
Accounts payable	112,659	(127,053)
Income taxes receivable/payable	13,993	16,265
Accrued expenses	(6,247)	(87,117)
Net cash provided by operating activities	288,899	234,707
Investing activities:
Purchases of property, plant and equipment	(27,708)	(33,351)
Other investing activities	3,054	1,663
Net cash used in investing activities	(24,654)	(31,688)
Financing activities:
Issuance of current and long-term debt	20,452	50,093
Repayment of current and long-term debt	(4,232)	(427,451)
Debt issuance costs	(5)
Proceeds from exercise of stock options, including related tax effect	2,892	1,753
Contributions from noncontrolling investors, net	(8)	(29)
Dividends paid	(33,425)	(27,766)
Net cash used in financing activities	(14,326)	(403,400)
Increase (decrease) in cash and equivalents	249,919	(200,381)
Cash and equivalents at beginning of period	727,032	361,363
Cash and equivalents at end of period	976,951	160,982
Supplemental disclosure information:
Cash paid for interest	26,286	40,094
Cash paid (received) for federal and state income taxes, net	$ 699	$ (18,539)