CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 135,153	$ 74,805	$ 70,949
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,173	44,712	37,042
Deferred taxes	(41,351)	13,801	16,378
Compensation expense related to share-based compensation plans	9,873	8,479	7,833
Loss (gain) on sale of assets	441	(573)	(129)
Excess tax benefits from share based compensation		(733)	(81)
Changes in operating assets and liabilities:
Restricted investments	(3,304)	231	836
Accounts receivable, net	(84,775)	(87,629)	36,373
Prepaid taxes	(11,794)	66	14,575
Prepaid expenses and other current assets	(7,543)	1,099	(3,401)
Other assets	56	570	(805)
Accounts payable	59,037	35,709	(25,736)
Accrued expenses	(2,931)	9,238	20,505
Non-current liabilities	10,185	2,698	(2,642)
Net cash provided by operating activities	125,220	102,473	171,697
Cash flows from investing activities:
Proceeds from sale of equipment	5,327	2,061	2,309
Purchases of property and equipment	(74,541)	(107,409)	(83,042)
Cash used in acquisition	(165,933)
Net cash used in investing activities	(235,147)	(105,348)	(80,733)
Cash flows from financing activities:
Proceeds from issuance of debt	98,544	62,155	64,442
Repayments of long-term debt	(79,869)	(34,767)	(23,217)
Stock tendered for payments of withholding taxes	(3,412)	(2,489)	(2,916)
Purchase of treasury stock		(100,000)	(28,823)
Capital lease payments	(2,800)	(2,634)	(2,534)
Excess tax benefits from share-based compensation		372	195
Payment of debt issuance costs	(1,397)
Net cash provided by (used in) financing activities	11,066	(77,363)	7,147
Effect of exchange rate changes on cash and cash equivalents	14	(107)	(131)
Net (decrease) increase in cash and cash equivalents	(98,847)	(80,345)	97,980
Cash and cash equivalents beginning of the year	127,404	207,749	109,769
Cash and cash equivalents end of the year	28,557	127,404	207,749
Supplemental disclosures of cash paid for:
Interest	6,162	3,665	2,977
Income taxes	$ 13,149	$ 33,233	$ 6,990

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration