CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net income	$ 11,577	$ 15,811
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,746	14,653
Stock-based compensation	7,397	3,920
Excess tax (benefit) deficiency from equity incentive plan activity	467	(12,853)
Changes in operating assets and liabilities:
Restricted cash and investments	(3,202)	(4,520)
Prepaid expenses and other current assets	(1,157)	(2,181)
Workers compensation receivables	(7,688)	(22,100)
Other assets	(312)	(13,259)
Accounts payable	6,111	(1,352)
Income taxes payable/receivable	6,735	29,153
Other current liabilities	(2,505)	(211)
Other liabilities	15,205	8,319
Worksite employee related assets	346,563	712,517
Worksite employee related liabilities	(347,039)	(714,570)
Net cash provided by operating activities	40,898	13,327
Investing activities
Acquisitions of businesses	(300)	0
Maturity of debt securities	1,500	0
Purchase of property and equipment	(6,807)	(3,853)
Net cash used in investing activities	(5,607)	(3,853)
Financing activities
Proceeds from issuance of common stock on exercised options	504	3,199
Excess tax benefit (deficiency) from equity incentive plan activity	(467)	12,853
Repayment of notes payable	(5,062)	(30,125)
Repayments under capital leases	(10)	(180)
Repurchase of common stock	0	(25,016)
Awards effectively repurchased for required employee withholding taxes	(656)	(9)
Net cash used in financing activities	(5,691)	(39,278)
Effect of exchange rate changes on cash and cash equivalents	160	(136)
Net increase (decrease) in cash and cash equivalents	29,760	(29,940)
Cash and cash equivalents at beginning of period	166,178	134,341
Cash and cash equivalents at end of period	195,938	104,401
Supplemental disclosures of cash flow information
Cash paid for interest	4,083	3,872
Cash paid for income taxes, net	2,572	(4,357)
Supplemental schedule of noncash investing and financing activities
Payable for purchase of property and equipment	1,435	1,034
Allowance for tenant improvements	$ 0	$ 791