Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Professional employer service fees	$ 112,503	$ 93,494	$ 214,192	$ 175,312
Staffing services	38,566	35,304	72,017	65,037
Total revenues	151,069	128,798	286,209	240,349
Cost of revenues:
Direct payroll costs	29,311	26,611	54,728	48,907
Payroll taxes and benefits	61,130	53,483	133,947	112,606
Workers' compensation	30,776	24,978	58,376	46,799
Total cost of revenues	121,217	105,072	247,051	208,312
Gross margin	29,852	23,726	39,158	32,037
Selling, general and administrative expenses	17,958	14,494	32,327	26,305
Depreciation and amortization	613	506	1,197	966
Income from operations	11,281	8,726	5,634	4,766
Other income (expense):
Investment income	157	173	301	345
Interest expense	(44)	(64)	(88)	(143)
Other	(7)	1	(17)	(5)
Other income	106	110	196	197
Income before income taxes	11,387	8,836	5,830	4,963
Provision for income taxes	4,104	2,950	2,130	1,626
Net income	$ 7,283	$ 5,886	$ 3,700	$ 3,337
Basic earnings per common share	$ 1.02	$ 0.83	$ 0.52	$ 0.47
Weighted average number of basic common shares outstanding	7,173	7,082	7,171	7,052
Diluted earnings per common share	$ 0.98	$ 0.80	$ 0.50	$ 0.45
Weighted average number of diluted common shares outstanding	7,421	7,374	7,444	7,344
Cash dividends per common share	$ 0.18	$ 0.13	$ 0.36	$ 0.26