CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net income	$ 25,325	$ 66,341	$ 52,279	$ 100,039
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	74,273	58,441	147,095	116,009
Equity-based compensation	6,357	4,700	14,900	10,468
Deferred income taxes	16,367	(280)	33,084	(4,371)
Loss on disposal of property, plant and equipment	998	3,456	5,983	6,097
Changes in certain assets and liabilities:
Accounts receivable	(47,149)	(99,696)	85,935	(188,646)
Inventories	161,174	11,230	326,173	(6,124)
Other assets	7,386	345	11,894	7,704
Accounts payable	62,735	13,385	(64,318)	18,426
Income taxes receivable/payable	(6,844)	(4,964)	9,421	14,429
Accrued expenses and liabilities	8,590	23,056	(78,527)	(25,264)
Net cash provided by operating activities	309,212	76,014	543,919	48,767
Investing activities:
Purchases of property, plant and equipment	(22,821)	(33,534)	(56,172)	(58,375)
Other investing activities	806	2,314	2,469	31,198
Net cash used in investing activities	(22,015)	(31,220)	(53,703)	(27,177)
Financing activities:
Issuance of current and long-term debt	60,941	63,945	111,034	107,398
Repayments of current and long-term debt	(60,557)	(76,412)	(488,008)	(132,658)
Exercise of stock options proceeds, including related tax effect	5,206	8,516	6,959	11,421
Contributions from noncontrolling investors, net	(1,135)	(606)	(1,164)	4,764
Dividends paid	(33,233)	(25,666)	(60,999)	(50,181)
Net cash used in financing activities	(28,778)	(30,223)	(432,178)	(59,256)
Increase (decrease) in cash and equivalents	258,419	14,571	58,038	(37,666)
Cash and equivalents at beginning of period	160,982	342,919	361,363	395,156
Cash and equivalents at end of period	419,401	357,490	419,401	357,490
Supplemental disclosure information:
Cash paid for interest	48,550	20,838	88,644	60,501
Cash paid (received) for federal and state income taxes, net	$ 7,046	$ 43,008	$ (11,493)	$ 45,151