Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows provided by (used in) operating activities:
Net income	$ 223,994	$ 269,659	$ 153,351
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	191,737	174,062	143,058
Amortization of debt issuance costs	3,774	4,259	4,139
Rationalization charges	6,253	5,826	19,061
Stock compensation expense	14,923	14,639	13,018
Loss on early extinguishment of debt	2,493	7,052	0
Deferred income tax provision (benefit)	23,740	(114,969)	45,011
Other changes that provided (used) cash, net of effects from acquisition:
Trade accounts receivable, net	516	(37,107)	(10,867)
Inventories	20,366	(17,228)	19,960
Trade accounts payable	61,095	84,102	52,752
Accrued liabilities	3,564	4,321	(20,145)
Other, net	(45,935)	(4,851)	(24,787)
Net cash provided by operating activities	506,520	389,765	394,551
Cash flows provided by (used in) investing activities:
Purchase of business, net of cash acquired	0	(1,023,848)	0
Capital expenditures	(190,973)	(174,429)	(191,893)
Other, net	1,051	600	11,555
Net cash used in investing activities	(189,922)	(1,197,677)	(180,338)
Cash flows provided by (used in) financing activities:
Borrowings under revolving loans	1,043,370	1,172,079	919,482
Repayments under revolving loans	(991,006)	(1,316,758)	(797,106)
Changes in outstanding checks – principally vendors	(4,125)	8,851	(22,819)
Proceeds from issuance of long-term debt	0	1,789,200	0
Repayments of long-term debt	(286,200)	(755,037)	(67,412)
Debt issuance costs	(3,272)	(16,964)	0
Dividends paid on common stock	(44,549)	(40,493)	(40,877)
Repurchase of common stock	(7,828)	(4,123)	(280,736)
Net cash (used in) provided by financing activities	(293,610)	836,755	(289,468)
Effect of exchange rate changes on cash and cash equivalents	(3,702)	0	0
Cash and cash equivalents:
Net increase (decrease)	19,286	28,843	(75,255)
Balance at beginning of year	53,533	24,690	99,945
Balance at end of year	72,819	53,533	24,690
Interest paid, net	118,377	97,595	65,471
Income taxes paid, net of refunds	$ 47,172	$ 70,239	$ 58,147