Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net earnings	$ 44,063	$ 33,804
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	29,816	20,190
Stock compensation expense	5,656	3,449
Deferred income taxes	27	(3,788)
Provision for doubtful accounts	(62)	239
Foreign currency transaction loss	126	84
Loss on disposal of assets	186	140
Changes in assets and liabilities
Accounts receivable	7,277	(8,639)
Inventories	(1,392)	(1,698)
Prepaid expenses and other current assets	2,068	1,531
Accounts payable and accrued expenses	(6,563)	3,146
Income taxes	(2,598)	214
Other	246	569
Net cash provided by operating activities	78,850	49,241
Cash flows from investing activities:
Capital expenditures	(28,117)	(5,934)
Cash paid for acquisition, net of cash acquired	0	(491,057)
Intangible assets acquired	(693)	(91)
Net cash used in investing activities	(28,810)	(497,082)
Cash flows from financing activities:
Proceeds from long-term debt	0	350,000
Principal payments on long-term debt	(26,250)	(8,750)
Proceeds from revolving loan	0	50,000
Principal payments on revolving loan	0	(50,000)
Principal payment on acquired debt	0	(75,550)
Cash paid for financing costs	0	(2,593)
Repayments of short-term obligations	0	(89)
Proceeds from stock options exercised	11,901	6,608
Excess tax benefits from stock compensation	6,688	3,626
Dividends paid	(9,251)	(7,856)
Purchase of treasury stock	(1,131)	(267)
Net cash (used in) provided by financing activities	(18,043)	265,129
Effect of exchange rate changes on cash	(728)	(631)
Increase (decrease) in cash and cash equivalents	31,269	(183,343)
Cash and cash equivalents beginning of period	50,287	208,747
Cash and cash equivalents end of period	$ 81,556	$ 25,404