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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 (loss) $ 14,318 $ 7,353 $ (3,945)
Reconciliations of net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 1,344 1,395 1,641
Gains recognized on marketable securities (52) (950) (639)
Gain recognized on sale and leaseback (122) (122) (122)
Deferred income taxes 453 746 676
Share based compensation 472 192 100
Changes in certain assets and liabilities, net of amounts purchased in acquisitions:      
Trade accounts receivable, net (8,924) (4,526) 1,319
Income taxes receivable (1,777) 3,836 (4,346)
Prepaid expenses and other (4,099) (819) 461
Accounts payable 675 (153) 236
Accrued payroll, payroll taxes and related benefits 14,815 7,281 (2,214)
Other accrued liabilities (142) (182) (403)
Workers' compensation claims liabilities 12,839 3,294 11,567
Safety incentives liability 1,297 587 (189)
Customer deposits, long-term liabilities and other assets, net 258 14 (1,117)
Net cash provided by operating activities 31,355 17,946 3,025
Cash flows from investing activities:      
Cash paid for acquisitions, including other direct costs 0 (375) 0
Purchase of property and equipment, net of amounts purchased in acquisitions (1,247) (1,606) (881)
Proceeds from sales and maturities of marketable securities 76,256 23,119 27,518
Purchase of marketable securities (78,012) (35,207) (29,344)
Proceeds from maturities of restricted marketable securities 7,854 4,697 3,979
Purchase of restricted marketable securities (9,027) (7,530) (3,944)
Net cash used in investing activities (4,176) (16,902) (2,672)
Cash flows from financing activities:      
Proceeds from credit-line borrowings 0 0 323
Payments on credit-line borrowings 0 0 (323)
Proceeds from the exercise of stock options 54 17 23
Dividends paid (3,835) (3,402) (3,356)
Repurchase of common stock (4,778) (3,415) (3,012)
Tax benefit of stock option exercises 27 9 449
Net cash used in financing activities (8,532) (6,791) (5,896)
Net increase (decrease) in cash and cash equivalents 18,647 (5,747) (5,543)
Cash and cash equivalents, beginning of year 30,924 36,671 42,214
Cash and cash equivalents, end of year 49,571 30,924 36,671
Supplemental schedule of noncash investing activities:      
Cost of acquisitions in excess of fair market value of net assets acquired 0 357 0
Intangible assets acquired 0 15 0
Tangible assets acquired 0 3 0
Net cash paid for acquisitions $ 0 $ 375 $ 0