CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 73,173	$ 78,312
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of discontinued operations, net of income taxes	0	(25,703)
Depreciation and amortization	46,171	35,495
Stock-based compensation	19,803	15,244
Provision for Doubtful Accounts	8,678	7,491
Write-off of loan costs	0	3,751
Gross excess tax benefits from stock-based compensation	(2,559)	(3,330)
Fair value adjustment for contingent consideration	613	1,408
Workers’ compensation provision	1,939	1,623
Other	4,065	2,717
Changes in operating assets and liabilities:
Accounts receivable	(47,385)	(54,713)
Prepaid expenses and income taxes	6,840	6,583
Accounts payable	(3,525)	(1,056)
Accrued payroll and contract professional pay	25,352	25,451
Income taxes payable	15,070	(4,084)
Workers’ compensation loss reserves	(1,913)	(701)
Other Payments to Acquire Businesses	(4,780)	0
Other	(1,194)	(1,191)
Net cash provided by operating activities	140,348	87,297
Cash Flows from Investing Activities:
Cash paid for property and equipment	(20,551)	(18,177)
Cash received from sale of discontinued operations, net	6,000	115,440
Payments to Acquire Businesses, Net of Cash Acquired	0	552,794
Other	(787)	16
Net cash used in investing activities	(15,338)	(455,515)
Cash Flows from Financing Activities:
Principal payments of long-term debt	(106,000)	(486,125)
Proceeds from Issuance of Long-term Debt	7,000	875,000
Proceeds from option exercises and employee stock purchase plan	9,458	6,398
Payment of employment taxes related to release of restricted stock awards	(5,968)	(6,600)
Gross excess tax benefits from stock-based compensation	2,559	3,330
Repurchase of common stock	(21,470)	(1,646)
Debt issuance or amendment costs	(889)	(23,890)
Payments of Merger Related Costs, Financing Activities	16,814	0
Net cash provided by (used in) financing activities	(132,124)	366,467
Effect of exchange rate changes on cash and cash equivalents	217	(1,047)
Net Increase (Decrease) in Cash and Cash Equivalents	(6,897)	(2,798)
Cash and Cash Equivalents at Beginning of Year	23,869	31,714
Cash and Cash Equivalents at End of Period	16,972	28,916
Supplemental Disclosure of Cash Flow Information:
Income taxes	23,974	30,595
Interest	20,798	14,741
Supplemental Disclosure of Non-Cash Transactions:
Acquisition of property and equipment through accounts payable	1,415	1,245
unsettled repurchases of common stock	$ 1,100	$ 0