CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net income	$ 23,859	$ 14,503
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,919	27,944
Deferred income taxes	0	1,977
Stock-based compensation	13,905	8,803
Excess tax benefit from equity incentive plan activity	(703)	(17,673)
Changes in operating assets and liabilities:
Restricted cash and investments	(21,041)	(13,413)
Prepaid expenses and other current assets	(5,033)	(5,082)
Workers compensation receivables	(10,599)	(5,083)
Other assets	238	(14,509)
Accounts payable	2,488	(35)
Prepaid income taxes	(2,863)	23,953
Accrued corporate wages and other current liabilities	(719)	(612)
Workers compensation and other liabilities	25,792	25,532
Worksite employee related assets	425,815	796,897
Worksite employee related liabilities	(426,094)	(798,024)
Net cash provided by operating activities	42,964	45,178
Investing activities
Acquisitions of businesses	(300)	0
Purchases of restricted investments	(14,959)	0
Proceeds from maturities of restricted investments	24,998	0
Purchase of property and equipment	(16,714)	(10,349)
Net cash used in investing activities	(6,975)	(10,349)
Financing activities
Proceeds from issuance of common stock on exercised options	2,220	4,639
Proceeds from issuance of common stock on employee stock purchase plan	2,304	2,723
Excess tax benefit from equity incentive plan activity	703	17,673
Repayment of notes payable and borrowings under capital leases	(22,810)	(35,325)
Repurchase of common stock	(16,459)	(30,000)
Awards effectively repurchased for required employee withholding taxes	(1,485)	(358)
Net cash used in financing activities	(35,527)	(40,648)
Effect of exchange rate changes on cash and cash equivalents	24	(109)
Net increase (decrease) in cash and cash equivalents	486	(5,928)
Cash and cash equivalents at beginning of period	166,178	134,341
Cash and cash equivalents at end of period	166,664	128,413
Supplemental disclosures of cash flow information
Cash paid for interest	8,091	7,806
Cash paid for income taxes, net	21,374	1,505
Supplemental schedule of noncash investing and financing activities
Payable for purchase of property and equipment	$ 1,581	$ 116