CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities:
Net income	$ 22,391	$ 17,401
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,475	15,427
Stock-based compensation	5,570	6,924
Provision for doubtful accounts and billing adjustments	2,807	2,602
Workers’ compensation provision	645	549
Other	2,990	1,706
Changes in operating assets and liabilities:
Accounts receivable	(10,154)	(25,362)
Prepaid expenses and income taxes	(457)	3,847
Accounts payable	712	(2,290)
Accrued payroll and contract professional pay	144	22,640
Income taxes payable	11,226	3,067
Workers’ compensation loss reserves	(493)	(699)
Other	(6,056)	(7,584)
Net cash provided by operating activities	43,800	38,228
Cash Flows from Investing Activities:
Cash paid for property and equipment	(6,792)	(7,282)
Cash received from sale of discontinued operations, net	0	6,000
Other	17	176
Net cash used in investing activities	(6,775)	(1,106)
Cash Flows from Financing Activities:
Principal payments of long-term debt	(26,000)	(33,000)
Proceeds from long-term debt	2,000	0
Proceeds from option exercises and employee stock purchase plan	4,106	4,023
Payment of employment taxes related to release of restricted stock awards	(5,782)	(3,590)
Repurchase of common stock	(12,136)	0
Debt issuance or amendment costs	2,403	0
Net cash used in financing activities	(40,215)	(32,567)
Effect of exchange rate changes on cash and cash equivalents	151	(55)
Net Increase (Decrease) in Cash and Cash Equivalents	(3,039)	4,500
Cash and Cash Equivalents at Beginning of Year	27,044	23,869
Cash and Cash Equivalents at End of Period	24,005	28,369
Supplemental Disclosure of Cash Flow Information:
Income taxes	936	3,926
Interest	7,492	7,261
Supplemental Disclosure of Non-Cash Transactions:
Unpaid portion of additions to property and equipment	$ 2,332	$ 287