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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flows from Operating Activities:    
Net income $ 17,401 $ 39,135
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 15,427 8,665
Stock-based compensation 6,924 3,954
Gross excess tax benefits from stock-based compensation (914) (1,643)
Workers’ compensation provision 549 586
Other 4,308 1,930
Changes in operating assets and liabilities:    
Accounts receivable (25,362) (14,584)
Prepaid expenses and income taxes 3,847 7,954
Accounts payable (2,290) 205
Accrued payroll and contract professional pay 22,640 3,160
Income taxes payable 3,067 (539)
Workers’ compensation loss reserves (699) (309)
Other (7,584) (2,868)
Net cash provided by operating activities 37,314 19,943
Cash Flows from Investing Activities:    
Cash paid for property and equipment (7,282) (8,000)
Cash received from sale of discontinued operations, net 6,000 114,884
Other 176 12
Net cash provided by (used in) investing activities (1,106) 106,896
Cash Flows from Financing Activities:    
Principal payments of long-term debt (33,000) (80,563)
Proceeds from option exercises and employee stock purchase plan 4,023 3,555
Payment of employment taxes related to release of restricted stock awards (3,590) (3,991)
Gross excess tax benefits from stock-based compensation 914 1,643
Repurchase of common stock 0 (1,645)
Debt issuance or amendment costs 0 (486)
Net cash used in financing activities (31,653) (81,487)
Effect of exchange rate changes on cash and cash equivalents (55) (703)
Net Increase (Decrease) in Cash and Cash Equivalents 4,500 44,649
Cash and Cash Equivalents at Beginning of Year 23,869 31,714
Cash and Cash Equivalents at End of Period 28,369 76,363
Supplemental Disclosure of Cash Flow Information:    
Income taxes 3,926 1,142
Interest 7,261 2,695
Supplemental Disclosure of Non-Cash Transactions:    
Acquisition of property and equipment through accounts payable $ 287 $ 1,011