Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows provided by (used in) operating activities:
Net income	$ 185,802	$ 123,539
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	146,246	129,734
Rationalization charges	1,483	4,485
Stock compensation expense	11,162	11,052
Loss on early extinguishment of debt	2,493	7,052
Other changes that provided (used) cash, net of effects from acquisition:
Trade accounts receivable, net	(271,636)	(285,901)
Inventories	(32,743)	(2,895)
Trade accounts payable	(11,185)	1,725
Accrued liabilities	(11,227)	16,003
Other, net	(7,304)	(9,247)
Net cash provided by (used in) operating activities	13,091	(4,453)
Cash flows provided by (used in) investing activities:
Purchase of business, net of cash acquired	0	(1,028,729)
Capital expenditures	(134,636)	(124,163)
Other, net	236	539
Net cash used in investing activities	(134,400)	(1,152,353)
Cash flows provided by (used in) financing activities:
Borrowings under revolving loans	923,639	1,108,208
Repayments under revolving loans	(266,477)	(680,986)
Proceeds from issuance of long-term debt	0	1,789,200
Repayments of long-term debt	(286,200)	(755,037)
Changes in outstanding checks - principally vendors	(87,795)	(78,944)
Dividends paid on common stock	(33,843)	(30,373)
Debt issuance costs	(2,866)	(16,643)
Repurchase of common stock under stock plan	(3,057)	(4,123)
Net cash provided by financing activities	243,401	1,331,302
Effect of exchange rate changes on cash and cash equivalents	(4,256)	0
Cash and cash equivalents:
Net increase	117,836	174,496
Balance at beginning of year	53,533	24,690
Balance at end of period	171,369	199,186
Interest paid, net	104,040	78,528
Income taxes paid, net	$ 39,400	$ 50,226