Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 55,704	$ 57,886
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,569	26,318
Amortization of other intangible assets	8,919	11,466
Acquisition-related contingent consideration	(1,145)	(1,591)
Provision for doubtful accounts	10,364	11,896
Non-cash share-based compensation	14,356	18,930
Non-cash interest expense	2,029	2,020
Loss on early extinguishment of debt	19,589
Other	(674)	(358)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(84,411)	(107,847)
Notes receivable	(334)	(18,266)
Prepaid expenses and other assets	(4,396)	7,099
Accounts payable, accrued expenses and other	10,158	10,538
Income taxes	15,371	8,315
Accrued compensation	(19,518)	(16,958)
Billings in excess of services provided	(5,278)	11,031
Net cash provided by operating activities	43,303	20,479
Investing activities
Payments for acquisition of businesses, net of cash received	(575)	(15,684)
Purchases of property and equipment	(24,674)	(31,797)
Other	94	69
Net cash used in investing activities	(25,155)	(47,412)
Financing activities
Borrowings under revolving line of credit, net	220,000
Payments of long-term debt	(425,671)	(6,014)
Payments of debt financing fees	(3,701)
Purchase and retirement of common stock		(4,367)
Net issuance of common stock under equity compensation plans	13,931	(29)
Deposits	2,406	12,956
Other	124	(1,036)
Net cash (used in) provided by financing activities	(192,911)	1,510
Effect of exchange rate changes on cash and cash equivalents	(3,943)	(1,632)
Net decrease in cash and cash equivalents	(178,706)	(27,055)
Cash and cash equivalents, beginning of period	283,680	205,833
Cash and cash equivalents, end of period	104,974	178,778
Supplemental cash flow disclosures
Cash paid for interest	37,031	25,323
Cash paid for income taxes, net of refunds	16,386	24,580
Issuance of stock units under incentive compensation plans	$ 2,124	$ 1,674