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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities    
Net income $ 127,243 $ 82,554
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 14,304 16,253
Amortization and impairment of other intangible assets 3,713 4,322
Acquisition-related contingent consideration 186 232
Provision for doubtful accounts 6,260 8,710
Non-cash share-based compensation 10,207 8,563
Amortization of debt discount and issuance costs 5,748 993
Other 225 798
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable, billed and unbilled (186,854) (99,299)
Notes receivable 8,343 4,214
Prepaid expenses and other assets (1,953) (4,151)
Accounts payable, accrued expenses and other (11,606) 352
Income taxes 24,424 13,143
Accrued compensation (55,183) (58,547)
Billings in excess of services provided 505 (12,722)
Net cash used in operating activities (54,438) (34,585)
Investing activities    
Purchases of property and equipment (20,661) (16,220)
Other 69 689
Net cash used in investing activities (20,592) (15,531)
Financing activities    
Proceeds from lines of credit 20,000  
Repayments of lines of credit   (25,000)
Deposits 1,014 2,602
Purchase and retirement of common stock (66,893) (14,220)
Net issuance of common stock under equity compensation plans 1,009 18,740
Payments for business acquisition liabilities (2,282) (3,029)
Net cash used in financing activities (47,152) (20,907)
Effect of exchange rate changes on cash and cash equivalents (781) (2,382)
Net decrease in cash and cash equivalents (122,963) (73,405)
Cash and cash equivalents, beginning of period 312,069 189,961
Cash and cash equivalents, end of period 189,106 116,556
Supplemental cash flow disclosures    
Cash paid for interest 3,467 13,020
Cash paid for income taxes, net of refunds 16,820 16,137
Non-cash investing and financing activities:    
Issuance of stock units under incentive compensation plans 1,346 1,059
Purchase and retirement of common stock not yet paid $ 3,322 $ 0