CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 56,471	$ 33,051
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	12,494	14,362
Impairment charges and other	0	11,120
Amortization of marketable securities	71	733
Stock-based compensation	12,527	10,174
Deferred income taxes	7,205	(7,904)
Changes in operating assets and liabilities:
Restricted cash	(4,361)	984
Accounts receivable	(40,744)	(98,305)
Prepaid insurance	(10,179)	1,124
Other current assets	(1,291)	2,393
Other assets	47	(6,827)
Accounts payable	(1,347)	(2,061)
Payroll taxes and other payroll deductions payable	(43,317)	(60,084)
Accrued worksite employee payroll expense	40,585	59,570
Accrued health insurance costs	7,064	(5,668)
Accrued workers’ compensation costs	16,172	20,246
Accrued corporate payroll, commissions and other accrued liabilities	(9,543)	1,169
Income taxes payable/receivable	(7,055)	247
Total adjustments	(21,672)	(58,727)
Net cash provided by (used in) operating activities	34,799	(25,676)
Marketable securities:
Purchases	(946)	(9,219)
Proceeds from dispositions	7,269	9,483
Proceeds from maturities	1,665	17,869
Property and equipment:
Purchases	(21,302)	(10,039)
Proceeds from sale of aircraft	0	12,159
Net cash provided by (used in) investing activities	(13,314)	20,253
Cash flows from financing activities:
Purchase of treasury stock	(13,913)	(58,557)
Payments for Repurchase of Common Stock	(144,263)	0
Dividends paid	(15,324)	(15,812)
Proceeds from the exercise of stock options	598	374
Income tax benefit from stock-based compensation	0	3,036
Borrowings under long-term debt agreement	124,400	0
Principal repayments	(20,000)	0
Other	1,029	1,011
Net cash used in financing activities	(67,473)	(69,948)
Net decrease in cash and cash equivalents	(45,988)	(75,371)
Cash and cash equivalents at beginning of period	269,538	276,456
Cash and cash equivalents at end of period	$ 223,550	$ 201,085