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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net Income $ 58,178 $ 43,458 $ 34,265
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 16,340 8,572 8,199
Deferred taxes 18,821 9,545 5,519
Compensation expense related to share-based compensation plans 4,788 3,576 4,394
(Gain) loss on sale of assets (17) 85 50
Changes in operating assets and liabilities, net of effects of acquisitions:      
Restricted investments (724) (1,838) (3,465)
Accounts receivable, net (45,047) (46,582) (1,569)
Prepaid taxes (2,097) 298 (470)
Prepaid expenses and other current assets (1,728) 233 (2,455)
Other assets (33) 298 (72)
Accounts payable 23,095 12,822 7,150
Accrued expenses 2,989 5,277 (8,603)
Non-current liabilities 301 1,910 2,285
Net cash provided by operating activities 74,866 37,654 45,228
Cash flows from investing activities:      
Proceeds from sale of equipment 410 988 84
Purchases of property and equipment (55,010) (25,616) (4,246)
Cash used in acquisitions, net of cash acquired (85,182) (170) 0
Net cash used in investing activities (139,782) (24,798) (4,162)
Cash flows from financing activities:      
Proceeds from stock options exercised 86 46 256
Purchase of treasury stock (1,523) (25,070) (1,101)
Capital lease payments (729)    
Excess tax benefits from share-based compensation 1,034 434 852
Net cash (used in) provided by financing activities (1,132) (24,590) 7
Effect of exchange rate changes on cash and cash equivalents (5) 15 (9)
Net (decrease) increase in cash and cash equivalents (66,053) (11,719) 41,064
Cash and cash equivalents beginning of year 115,144 126,863 85,799
Cash and cash equivalents end of year 49,091 115,144 126,863
Supplemental disclosures of cash paid for:      
Interest 541 54 91
Income taxes $ 18,629 $ 16,031 $ 17,263