Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 8,860	$ 56,728
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	16,298	16,049
Amortization and impairment of other intangible assets	4,915	5,196
Acquisition-related contingent consideration	1,172	1,340
Provision for doubtful accounts	5,971	4,344
Non-cash share-based compensation	9,959	9,667
Non-cash interest expense	992	992
Other	242	(639)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(78,100)	(57,501)
Notes receivable	2,241	(4,640)
Prepaid expenses and other assets	947	(943)
Accounts payable, accrued expenses and other	(1,887)	1,932
Income taxes	3,087	29,329
Accrued compensation	(64,531)	(28,518)
Billings in excess of services provided	7,634	7,297
Net cash provided by (used in) operating activities	(82,200)	40,633
Investing activities
Payments for acquisition of businesses, net of cash received		(56)
Purchases of property and equipment	(13,127)	(11,983)
Other	72	96
Net cash used in investing activities	(13,055)	(11,943)
Financing activities
Borrowings under revolving line of credit, net	115,000
Deposits	3,262	2,557
Purchase and retirement of common stock	(102,513)	(2,903)
Net issuance of common stock under equity compensation plans	(500)	9,353
Other	(79)	(154)
Net cash provided by financing activities	15,170	8,853
Effect of exchange rate changes on cash and cash equivalents	2,438	(4,638)
Net increase (decrease) in cash and cash equivalents	(77,647)	32,905
Cash and cash equivalents, beginning of period	216,158	149,760
Cash and cash equivalents, end of period	138,511	182,665
Supplemental cash flow disclosures
Cash paid for interest	14,903	11,242
Cash paid for income taxes, net of refunds	5,336	4,493
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	$ 1,547	$ 1,842