CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 9,564	$ 13,173
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,260	5,135
Amortization of marketable securities	510	441
Stock-based compensation	2,400	2,310
Deferred income taxes	6,387	3,252
Changes in operating assets and liabilities:
Restricted cash	(234)	(225)
Accounts receivable	(12,390)	(10,814)
Prepaid insurance	(24,155)	(1,267)
Other current assets	(7,175)	(4,108)
Other assets	(2,990)	(3,109)
Accounts payable	(87)	(1,458)
Payroll taxes and other payroll deductions payable	(1,619)	4,977
Accrued worksite employee payroll expense	13,510	18,645
Accrued health insurance costs	20,605	(6,458)
Accrued workers’ compensation costs	2,837	418
Accrued corporate payroll, commissions and other accrued liabilities	5,340	(3,978)
Income taxes payable/receivable	(8,872)	538
Total adjustments	(673)	4,299
Net cash provided by operating activities	8,891	17,472
Marketable securities:
Purchases	(7,668)	(40,046)
Proceeds from dispositions	0	4,138
Proceeds from maturities	6,595	1,001
Property and equipment	(2,379)	(2,843)
Net cash used in investing activities	(3,452)	(37,750)
Cash flows from financing activities:
Purchase of treasury stock	(13,884)	(13,498)
Dividends paid	(4,351)	(4,349)
Proceeds from the exercise of stock options	163	118
Income tax benefit from stock-based compensation	78	665
Other	318	230
Net cash used in financing activities	(17,676)	(16,834)
Net decrease in cash and cash equivalents	(12,237)	(37,112)
Cash and cash equivalents at beginning of period	225,755	264,544
Cash and cash equivalents at end of period	$ 213,518	$ 227,432