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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities    
Net income (loss) $ 30,181 $ 23,686
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 7,971 7,808
Amortization and impairment of other intangible assets 2,606 3,012
Acquisition-related contingent consideration 1,134 234
Provision for doubtful accounts 437 2,998
Non-cash share-based compensation 6,158 6,736
Non-cash interest expense 497 671
Other (81) (132)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable, billed and unbilled (52,047) (41,330)
Notes receivable 3,853 (1,003)
Prepaid expenses and other assets 3,824 3,583
Accounts payable, accrued expenses and other 5,619 15,959
Income taxes 17,561 5,524
Accrued compensation (65,511) (74,987)
Billings in excess of services provided 4,699 (4,092)
Net cash used in operating activities (33,099) (51,333)
Investing activities    
Purchases of property and equipment (6,362) (8,876)
Other 34 71
Net cash used in investing activities (6,328) (8,805)
Financing activities    
Borrowings under revolving line of credit, net 7,000  
Deposits 2,590 1,380
Purchase and retirement of common stock (2,903)  
Net issuance of common stock under equity compensation plans (1,371) 4,031
Other (135) (85)
Net cash provided by financing activities 5,181 5,326
Effect of exchange rate changes on cash and cash equivalents (1,063) (3,573)
Net decrease in cash and cash equivalents (35,309) (58,385)
Cash and cash equivalents, beginning of period 149,760 283,680
Cash and cash equivalents, end of period 114,451 225,295
Supplemental cash flow disclosures    
Cash paid for interest 1,255 226
Cash paid for income taxes, net of refunds 824 6,134
Non-cash investing and financing activities:    
Issuance of stock units under incentive compensation plans $ 1,842 $ 2,124