CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net income	$ 1,255,805	$ 805,796	$ 360,006
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	317,198	298,999	296,109
Asset impairment charges			132,839
Equity-based compensation	43,317	36,197	31,656
Deferred income taxes	61,827	(135,899)	53,846
Other adjustments	(1,245)	14,068	20,676
Changes in certain assets and liabilities:
Accounts receivable	(145,873)	(139,054)	(106,617)
Inventories	(246,213)	(242,883)	(115,575)
Other assets	(3,475)	4,002	12,044
Accounts payable	37,904	96,062	106,521
Income taxes receivable/payable	26,471	(33,889)	(13,921)
Accrued expenses	69,753	36,021	75,176
Net cash provided by operating activities	1,415,469	739,420	852,760
Investing activities:
Purchases of property, plant and equipment	(239,390)	(164,935)	(198,160)
Purchases of short term investments	(268,783)
Proceeds from maturities of short term investments	40,000
Acquisition of business, net of cash acquired	(433,998)	(6,192)	(123,351)
Other investing activities	6,907	32,022	8,618
Net cash used in investing activities	(895,264)	(139,105)	(312,893)
Financing activities:
Issuance of current and long-term debt	445,607	620,041	473,903
Repayment of current and long-term debt	(455,491)	(609,914)	(728,993)
Dividends paid	(168,913)	(145,565)	(135,767)
Purchases of treasury stock	(523,569)	(252,242)	(25,034)
Other financing activities	(18,501)	(25,655)	(9,534)
Net cash used in financing activities	(720,867)	(413,335)	(425,425)
Increase (decrease) in cash and equivalents, and restricted cash	(200,662)	186,980	114,442
Cash and equivalents, and restricted cash at beginning of period	1,035,085	848,105	733,663
Cash and equivalents, and restricted cash at end of period	834,423	1,035,085	848,105
Supplemental disclosure information:
Cash paid for interest	124,034	135,381	150,679
Cash paid for income taxes, net	$ 288,429	$ 296,493	$ 159,950