Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net earnings	$ 15,172us-gaap_NetIncomeLoss	$ 8,894us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	10,026	2,631
Stock compensation expense	1,174us-gaap_ShareBasedCompensation	988us-gaap_ShareBasedCompensation
Deferred income taxes	4us-gaap_DeferredIncomeTaxExpenseBenefit	55us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for doubtful accounts	(16)us-gaap_ProvisionForDoubtfulAccounts	0us-gaap_ProvisionForDoubtfulAccounts
Foreign currency transaction loss	34	36
Loss on disposal of assets	85us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Changes in assets and liabilities
Accounts receivable	7,125	(4,387)
Inventories	(1,286)us-gaap_IncreaseDecreaseInInventories	(50)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	1,322	526
Accounts payable and accrued expenses	(7,010)	400
Income taxes	(168)	1,123
Customer deposits and other deferred revenue	11	0
Other	125	24
Net cash provided by operating activities	26,598	10,240
Cash flows from investing activities:
Deposit held in escrow	0	(5,500)
Capital expenditures	(6,368)	(1,138)
Intangible assets acquired	(387)	(27)
Net cash used in investing activities	(6,755)	(6,665)
Cash flows from financing activities:
Principal payments on long-term debt	(8,750)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Repayments of short-term obligations	0us-gaap_RepaymentsOfShortTermDebt	(89)us-gaap_RepaymentsOfShortTermDebt
Proceeds from stock options exercised	3,175	1,327
Excess tax benefits from stock compensation	2,488	1,689
Dividends paid	(9,251)us-gaap_PaymentsOfDividends	(7,856)us-gaap_PaymentsOfDividends
Purchase of treasury stock	0	(33)
Net cash provided by financing activities	(12,338)	(4,962)
Effect of exchange rate changes on cash	(1,179)	(30)
Increase (decrease) in cash and cash equivalents	6,326	(1,417)
Cash and cash equivalents beginning of period	50,287	208,747
Cash and cash equivalents end of period	$ 56,613	$ 207,330

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