Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 39,709	$ 66,258
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38,220	22,636
Share-based compensation	15,288	15,504
Amortization of debt discount and issuance costs	6,985	1,482
Allowances for doubtful accounts and unbilled services	(1,605)	8,829
Deferred income taxes	13,407	1,817
Changes in operating assets and liabilities, net of acquisitions:
(Increase) decrease in receivables from clients	(14,725)	26,807
(Increase) decrease in unbilled services	15,179	(44,020)
(Increase) decrease in current income tax receivable / payable, net	3,704	(9,690)
(Increase) decrease in other assets	(5,381)	3,258
Increase (decrease) in accounts payable and accrued liabilities	8,459	11,466
Increase (decrease) in accrued payroll and related benefits	(43,510)	(9,565)
Increase (decrease) in deferred revenues	7,507	(2,661)
Net cash provided by operating activities	83,237	92,121
Cash flows from investing activities:
Purchases of property and equipment, net	(15,040)	(16,683)
Investment in life insurance policies	(4,823)	(1,151)
Purchases of businesses	(332,766)	(51,694)
Purchases of convertible debt investment	(15,138)	(12,500)
Capitalization of internally developed software costs	(735)	0
Proceeds from note receivable	0	328
Net cash used in investing activities	(368,502)	(81,700)
Cash flows from financing activities:
Proceeds from exercise of stock options	0	848
Shares redeemed for employee tax withholdings	(5,194)	(3,461)
Tax benefit from share-based compensation	3,117	4,962
Share repurchases	(13,498)	(45,092)
Proceeds from borrowings under credit facility	272,000	129,000
Repayments on credit facility	(214,500)	(147,750)
Proceeds from Convertible Debt	0	250,000
Aggregate proceeds from the sale of warrants	0	23,625
Payments For Note Hedges	0	(42,125)
Payments for debt issue costs	0	(7,346)
Payments for capital lease obligations	(48)	(63)
Deferred Payments To Acquire Property, Plant, And Equipment	0	(471)
Deferred Acquisition Payments	0	(4,745)
Net cash provided by financing activities	41,877	157,382
Effect of exchange rate changes on cash	(22)	(21)
Net (decrease) increase in cash and cash equivalents	(243,410)	167,782
Cash and cash equivalents at beginning of the period	256,872	58,131
Cash and cash equivalents at end of the period	13,462	225,913
Non-cash investing and financing activities:
Property and equipment expenditures included in accounts payable and accrued expenses	2,201	2,755
Contingent consideration related to business acquisitions	900	590
Common stock issued related to business acquisition	$ 2,204	$ 0