CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 75,899	$ 68,130
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,903	9,067
Amortization of intangible assets	11,789	10,890
Amortization of debt issuance costs	329	378
Share-based compensation expense	6,159	6,442
Deferred income taxes	1,293	2,950
Non-cash interest expense associated with forward starting swaps	1,677	1,724
Changes in (net of effect from acquisitions):
Receivables	(20,058)	(19,267)
Inventories	(2,761)	(270)
Other current assets	6,570	(6,597)
Trade accounts payable	5,188	6,451
Accrued expenses	(11,565)	(6,641)
Other - net	1,556	(2,892)
Net cash flows provided by operating activities	84,979	70,365
Cash flows from investing activities
Additions of property, plant and equipment	(10,162)	(8,650)
Acquisition of businesses, net of cash acquired	0	(221,556)
Other - net	546	91
Net cash flows (used in) investing activities	(9,616)	(230,115)
Cash flows from financing activities
Borrowings under revolving facilities	13,000	275,391
Payments under revolving facilities	(80,224)	(20,994)
Dividends paid	(26,327)	(24,662)
Proceeds from stock option exercises	6,074	8,258
Purchase of common stock	(7,005)	(46,864)
Unvested shares surrendered for tax withholding	(5,647)	(4,717)
Other - net	738	0
Net cash flows provided by (used in) financing activities	(99,391)	186,412
Effect of exchange rate changes on cash and cash equivalents	4,159	3,765
Net increase (decrease) in cash	(19,869)	30,427
Cash and cash equivalents at beginning of year	235,964	328,018
Cash and cash equivalents at end of period	216,095	358,445
Cash paid for:
Interest	760	965
Income taxes - net	$ 5,888	$ 9,516