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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 69,110 $ 67,953 $ 58,178
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 21,302 21,575 16,340
Impairment of trade name 2,904    
Deferred taxes 16,438 8,786 18,821
Compensation expense related to share-based compensation plans 7,667 6,539 4,788
(Gain) loss on sale of assets (167) 108 (17)
Excess tax benefits from share based compensation (13) (29)  
Changes in operating assets and liabilities, net of effects of acquisitions:      
Restricted investments (3,536) (2,895) (724)
Accounts receivable, net (25,420) (22,429) (45,047)
Prepaid taxes (308) 2,253 (2,097)
Prepaid expenses and other current assets (2,137) (1,562) (1,728)
Other assets (682) 459 (33)
Accounts payable 27,635 7,438 23,095
Accrued expenses 1,736 2,779 2,989
Non-current liabilities 2,888 1,942 301
Net cash provided by operating activities 117,417 92,917 74,866
Cash flows from investing activities:      
Proceeds from sale of equipment 1,837 1,071 410
Purchases of property and equipment (110,917) (56,882) (55,010)
Cash used in acquisitions, net of cash acquired   (550) (85,182)
Net cash used in investing activities (109,080) (56,361) (139,782)
Cash flows from financing activities:      
Proceeds from issuance of debt 9,120    
Repayments of long term debt (874)    
Proceeds from stock options exercised 41 69 86
Stock tendered for payments of withholding taxes (2,634) (1,812) (1,523)
Purchase of treasury stock (13,791) (11,208)  
Capital lease payments (2,329) (2,454) (729)
Excess tax benefits from share-based compensation 336 523 1,034
Net cash used in financing activities (10,131) (14,882) (1,132)
Effect of exchange rate changes on cash and cash equivalents (2) (5) (5)
Net (decrease) increase in cash and cash equivalents (1,796) 21,669 (66,053)
Cash and cash equivalents beginning of the year 70,760 49,091 115,144
Cash and cash equivalents end of the year 68,964 70,760 49,091
Supplemental disclosures of cash paid for:      
Interest 1,201 1,200 541
Income taxes $ 29,728 $ 28,638 $ 18,629