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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 70,949	$ 51,558	$ 69,110
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,042	29,380	21,302
Impairment of software		11,881
Impairment of trade name			2,904
Deferred taxes	16,378	24,501	16,438
Compensation expense related to share-based compensation plans	7,833	8,258	7,667
Gain on sale of assets	(129)	(46)	(167)
Excess tax benefits from share based compensation	(81)		(13)
Changes in operating assets and liabilities:
Restricted investments	836	(1,190)	(3,536)
Accounts receivable, net	36,373	(28,621)	(25,420)
Prepaid taxes	14,575	(14,533)	(308)
Prepaid expenses and other current assets	(3,401)	(1,621)	(2,137)
Other assets	(805)	(2,047)	(682)
Accounts payable	(25,736)	20,370	27,635
Accrued expenses	20,505	367	1,736
Non-current liabilities	(2,642)	284	2,888
Net cash provided by operating activities	171,697	98,541	117,417
Cash flows from investing activities:
Proceeds from sale of equipment	2,309	612	1,837
Purchases of property and equipment	(83,042)	(119,171)	(110,917)
Net cash used in investing activities	(80,733)	(118,559)	(109,080)
Cash flows from financing activities:
Proceeds from issuance of debt	64,442	91,084	9,120
Repayments of long term debt	(23,217)	(7,251)	(874)
Proceeds from stock options exercised	0	0	41
Stock tendered for payments of withholding taxes	(2,916)	(3,195)	(2,634)
Purchase of treasury stock	(28,823)	(18,024)	(13,791)
Capital lease payments	(2,534)	(2,449)	(2,329)
Excess tax benefits from share-based compensation	195	652	336
Net cash provided by (used in) financing activities	7,147	60,817	(10,131)
Effect of exchange rate changes on cash and cash equivalents	(131)	6	(2)
Net increase (decrease) in cash and cash equivalents	97,980	40,805	(1,796)
Cash and cash equivalents beginning of the year	109,769	68,964	70,760
Cash and cash equivalents end of the year	207,749	109,769	68,964
Supplemental disclosures of cash paid for:
Interest	2,977	1,532	1,201
Income taxes	$ 6,990	$ 20,189	$ 29,728

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from sale of machinery and equipment.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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