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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues:      
Professional employer service fees $ 276,004 $ 190,113 $ 147,385
Staffing services 126,648 124,761 125,738
Total revenues 402,652 314,874 273,123
Cost of revenues:      
Direct payroll costs 95,128 94,568 95,439
Payroll taxes and benefits 169,724 123,017 96,660
Workers' compensation 71,086 53,837 36,284
Total cost of revenues 335,938 271,422 228,383
Gross margin 66,714 43,452 44,740
Selling, general and administrative expenses 46,450 38,174 35,429
Depreciation and amortization 1,477 1,344 1,395
Income from operations 18,787 3,934 7,916
Other income (expense):      
Life insurance proceeds 0 10,000 0
Investment income, net 700 1,174 849
Other (28) 47 1,162
Other income 672 11,221 2,011
Income before income taxes 19,459 15,155 9,927
Provision for income taxes 6,328 837 2,574
Net income $ 13,131 $ 14,318 $ 7,353
Basic earnings per share $ 1.70 $ 1.42 $ 0.71
Weighted average number of basic shares outstanding 7,723 10,083 10,333
Diluted earnings per share $ 1.67 $ 1.41 $ 0.71
Weighted average number of diluted shares outstanding 7,863 10,150 10,372
Cash dividends per common share $ 0.46 $ 0.38 $ 0.33