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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 7,342 $ 14,409
Reconciliations of net income to net cash provided by operating activities:    
Depreciation and amortization 1,076 1,000
Gains recognized on marketable securities (1) (99)
Gain recognized on sale and leaseback (92) (92)
Deferred income taxes 30 166
Share based compensation 490 332
Changes in certain assets and liabilities:    
Trade accounts receivable, net (24,498) (13,274)
Income taxes receivable 701 0
Prepaid expenses and other 4,361 (10)
Accounts payable 496 342
Accrued payroll, payroll taxes and related benefits 25,193 15,164
Other accrued liabilities 55 160
Income taxes payable 2,969 1,517
Workers' compensation claims liabilities 11,835 4,209
Safety incentives liability 2,357 836
Customer deposits, long-term liabilities and other assets, net 133 115
Net cash provided by operating activities 32,447 24,775
Cash flows from investing activities:    
Purchase of property and equipment (2,666) (836)
Proceeds from sales and maturities of marketable securities 32,676 55,590
Purchase of marketable securities (28,959) (60,745)
Proceeds from maturities of restricted marketable securities 6,495 5,942
Purchase of restricted marketable securities (6,539) (6,876)
Net cash provided by (used in) investing activities 1,007 (6,925)
Cash flows from financing activities:    
Proceeds from credit-line borrowings 12,186 0
Payments on credit-line borrowings (12,186)  
Redemption of mandatorily redeemable preferred stock (34,800) 0
Proceeds from exercise of stock options 1,768 5
Dividends paid (2,639) (2,748)
Repurchase of common stock (25,432) (3,827)
Tax benefit of stock option exercises 259 13
Net cash used in financing activities (60,844) (6,557)
Net (decrease) increase in cash and cash equivalents (27,390) 11,293
Cash and cash equivalents, beginning of period 49,571 30,924
Cash and cash equivalents, end of period 22,181 42,217
Supplemental schedule of noncash financing activities:    
Issuance of mandatorily redeemable preferred stock $ 34,800 $ 0