Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 144,710	$ 128,936
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	150,269	65,714
Provision for doubtful accounts	978	148
Amortization of debt issuance costs	535	220
Stock-based compensation expense	6,303	2,303
Loss from disposition of property, plant and equipment	2,899	309
Gains realized from sales of securities	0	(52)
Write-off of debt issuance costs	659	0
Deferred income taxes	(6,273)	58,637
Windfall tax benefits from share-based payment arrangements	0	(266)
Loss (income) from equity method investments, net of dividends	511	(223)
Gain on involuntary conversion of assets	(1,555)	0
Other losses (gains), net	(835)	661
Changes in operating assets and liabilities, net of effect of business acquisitions
Accounts receivable	(64,676)	(36,324)
Inventories	(19,244)	(40,878)
Prepaid expenses and other current assets	5,572	(10,791)
Accounts payable	49,377	23,752
Accrued liabilities	(121,851)	(54,257)
Other, net	10,015	(8,954)
Net cash provided by operating activities	157,394	128,935
Cash flows from investing activities
Additions to property, plant and equipment	(134,285)	(136,328)
Additions to cost method investment	(15,000)	0
Proceeds from disposition of assets	66	104
Proceeds from involuntary conversion of assets	1,555	0
Proceeds from sales and maturities of securities	0	26,859
Purchase of securities	0	(36,637)
Settlements of derivative instruments	(355)	(1,219)
Net cash used for investing activities	(148,019)	(147,221)
Cash flows from financing activities
Debt issuance costs	(319)	0
Dividends paid	(24,656)	(23,700)
Distributions to noncontrolling interests	(4,463)	(3,985)
Proceeds from issuance of notes payable	1,874	2,050
Proceeds from drawdown of revolver	50,000	0
Restricted cash associated with term loan	154,000	0
Repayment of term loan	(150,000)	0
Repayment of notes payable	(2,469)	(7,095)
Repayment of revolver	(125,000)	0
Repurchase of common stock for treasury	0	(679)
Other	1,354	288
Net cash used for financing activities	(99,679)	(33,121)
Effect of exchange rate changes on cash and cash equivalents	3,442	3,858
Net decrease in cash and cash equivalents	(86,862)	(47,549)
Cash and cash equivalents at beginning of period	459,453	662,525
Cash and cash equivalents at end of period	$ 372,591	$ 614,976