CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 27,831	$ 13,446
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,468	5,481
Amortization	28,406	38,004
Stock-based compensation expense	3,215	8,559
Amortization of debt issuance costs and discount	498	2,024
Deferred income tax benefit	(420)	(568)
Other	(615)	(256)
Changes in assets and liabilities:
Accounts receivable and unbilled, net	5,340	(16,606)
Prepaid expenses and other current assets	(1,271)	(8,733)
Accounts payable	(467)	(943)
Accrued expenses	(4,840)	1,257
Pre-funded study costs	1,149	6,810
Advanced billings	2,381	16,560
Other assets and liabilities, net	1,058	(2,368)
Net cash provided by operating activities	68,733	62,667
CASH FLOWS FROM INVESTING ACTIVITIES:
Property and equipment expenditures	(8,329)	(7,843)
Acquisition of intangibles	(569)	0
Other	44	83
Net cash used in investing activities	(8,854)	(7,760)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment for common stock issuance costs	0	(2,719)
Proceeds from stock option exercises	1,187	452
Repurchases of common stock	(95,260)	0
Payment of debt	(9,281)	(225,054)
Proceeds from revolving loan	40,000	0
Payments on revolving loan	(10,000)	0
Payment of deemed landlord liability	(1,240)	(1,129)
Proceeds from common stock issued, net of underwriters discount	0	173,578
Net cash used in financing activities	(74,594)	(54,872)
EFFECT OF EXCHANGE RATES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	1,555	227
(DECREASE) INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(13,160)	262
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — Beginning of period	37,407	17,737
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — End of period	$ 24,247	$ 17,999