Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net earnings	$ 30,088	$ 18,626
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	19,891	9,864
Stock compensation expense	2,684	2,348
Deferred income taxes	55	75
Provision for doubtful accounts	(106)	68
Foreign currency transaction loss	60	7
Loss on disposal of assets	106	0
Changes in assets and liabilities
Accounts receivable	7,962	(9,397)
Inventories	1,378	(256)
Prepaid expenses and other current assets	1,396	215
Accounts payable and accrued expenses	(9,786)	3,262
Income taxes	(4,046)	2,552
Customer deposits and other deferred revenue	0	(35)
Other	184	274
Net cash provided by operating activities	49,866	27,603
Cash flows from investing activities:
Capital expenditures	(15,299)	(3,504)
Cash paid for acquisition, net of cash acquired	0	(491,057)
Intangible assets acquired	(617)	(41)
Net cash used in investing activities	(15,916)	(494,602)
Cash flows from financing activities:
Proceeds from long-term debt	0	350,000
Principal payments on long-term debt	(17,500)	0
Proceeds from revolving loan	0	50,000
Principal payment on acquired debt	0	(75,550)
Cash paid for financing costs	0	(2,543)
Repayments of short-term obligations	0	(89)
Proceeds from stock options exercised	9,920	2,881
Excess tax benefits from stock compensation	5,785	1,472
Dividends paid	(9,251)	(7,856)
Purchase of treasury stock	(21)	(267)
Net cash (used in) provided by financing activities	(11,067)	318,048
Effect of exchange rate changes on cash	(927)	(82)
Increase (decrease) in cash and cash equivalents	21,956	(149,033)
Cash and cash equivalents beginning of period	50,287	208,747
Cash and cash equivalents end of period	$ 72,243	$ 59,714