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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities:    
Net income $ 62,653 $ 55,488
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 42,999 28,842
Stock-based compensation 13,761 11,561
Provision for accounts receivable allowances 1,315 5,744
Workers’ compensation provision 1,401 1,682
Other 8,471 3,791
Changes in operating assets and liabilities:    
Accounts receivable (32,009) (35,222)
Prepaid expenses and income taxes 12,002 (2,343)
Accounts payable (3,242) 42
Accrued payroll and contract professional pay 22,222 6,302
Income taxes payable 4,913 11,679
Workers’ compensation loss reserves (1,516) (1,351)
Other (1,491) (2,622)
Net Cash Provided by Operating Activities 131,479 83,593
Cash Flows from Investing Activities:    
Cash paid for property and equipment (14,593) (13,208)
Payments to Acquire Businesses, Net of Cash Acquired 760,517 0
Other (120) (148)
Net cash used in investing activities (775,230) (13,356)
Cash Flows from Financing Activities:    
Principal payments of long-term debt (143,000) (64,000)
Proceeds from long-term debt 822,000 2,000
Payments of Debt Issuance Costs 22,451 2,441
Proceeds from option exercises and employee stock purchase plan 4,419 4,148
Payment of employment taxes related to release of restricted stock awards (3,199) (6,863)
Repurchase of common stock 0 (12,136)
Proceeds from (Payments for) Other Financing Activities (5,286) 0
Net Cash Used in Financing Activities 652,483 (79,292)
Effect of exchange rate changes on cash and cash equivalents (742) 974
Net Increase (Decrease) in Cash and Cash Equivalents 7,990 (8,081)
Cash and Cash Equivalents at Beginning of Year 36,667 27,044
Cash and Cash Equivalents at End of Period 44,657 18,963
Supplemental Disclosure of Cash Flow Information:    
Income taxes 4,600 20,789
Interest 24,714 12,799
Supplemental Disclosure of Non-Cash Transactions:    
Unpaid portion of additions to property and equipment $ 1,713 $ 2,149