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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 52,574 $ 49,109
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 15,479 16,300
Deferred taxes 10,945 7,693
Compensation expense related to share-based compensation plans 5,638 4,826
(Gain) loss on sale of assets (345) 42
Excess tax benefits from share-based compensation (11) (97)
Changes in operating assets and liabilities:    
Restricted investments (1,924) (2,206)
Accounts receivable, net (57,439) (57,417)
Prepaid taxes (504) 2,253
Prepaid expenses and other current assets 156 (1,913)
Other assets (803) 685
Accounts payable 55,641 38,386
Accrued expenses 1,330 8,917
Non-current liabilities 1,164 1,210
Net cash provided by operating activities 81,901 67,788
Cash flows from investing activities:    
Proceeds from sale of equipment 1,788 819
Purchases of property and equipment (66,079) (34,671)
Cash used in acquisitions   (425)
Net cash used in investing activities (64,291) (34,277)
Cash flows from financing activities:    
Proceeds from issuance of debt 9,120  
Repayments of long term debt (436)  
Proceeds from stock options exercised 42 46
Stock tendered for payments of withholding taxes (2,621) (1,800)
Purchase of treasury stock (903)  
Capital lease payments (1,733) (1,697)
Excess tax benefits from share-based compensation 310 443
Net cash provided by (used in) financing activities 3,779 (3,008)
Effect of exchange rate changes on cash and cash equivalents 1 (9)
Net increase in cash and cash equivalents 21,390 30,494
Cash and cash equivalents beginning of period 70,760 49,091
Cash and cash equivalents end of period 92,150 79,585
Supplemental disclosures of cash paid for:    
Interest 887 917
Income taxes $ 24,372 $ 20,286