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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities    
Net income $ 14,016 $ 30,181
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 8,571 7,971
Amortization and impairment of other intangible assets 2,493 2,606
Acquisition-related contingent consideration 395 1,134
Provision for doubtful accounts 3,551 437
Non-cash share-based compensation 7,281 6,158
Non-cash interest expense 496 497
Other 12 (81)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable, billed and unbilled (52,489) (52,047)
Notes receivable 7,153 3,853
Prepaid expenses and other assets 553 3,824
Accounts payable, accrued expenses and other 287 5,619
Income taxes 3,650 17,561
Accrued compensation (92,561) (65,511)
Billings in excess of services provided 3,505 4,699
Net cash used in operating activities (93,087) (33,099)
Investing activities    
Purchases of property and equipment (5,831) (6,362)
Other 127 34
Net cash used in investing activities (5,704) (6,328)
Financing activities    
Borrowings under revolving line of credit, net 37,000 7,000
Deposits 3,069 2,590
Purchase and retirement of common stock (36,918) (2,903)
Net issuance of common stock under equity compensation plans (812) (1,371)
Other   (135)
Net cash provided by financing activities 2,339 5,181
Effect of exchange rate changes on cash and cash equivalents 1,253 (1,063)
Net decrease in cash and cash equivalents (95,199) (35,309)
Cash and cash equivalents, beginning of period 216,158 149,760
Cash and cash equivalents, end of period 120,959 114,451
Supplemental cash flow disclosures    
Cash paid for interest 762 1,255
Cash paid for income taxes, net of refunds 4,246 824
Non-cash investing and financing activities:    
Issuance of stock units under incentive compensation plans $ 1,547 $ 1,842