CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 22,152	$ 19,094
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	7,545	6,926
Amortization	15,175	16,924
Amortization of original issue discount	3,063	2,834
Loss on short-term investments and other	122	735
Gain on disposition of business operations		(222)
Deferred income taxes	(3,758)	766
Excess tax benefit of stock-based compensation awards	(1,809)	(1,984)
Stock-based employee compensation	10,473	7,714
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	5,398	(13,457)
Other current and non-current assets	(3,452)	(8,987)
Income taxes payable/receivable	(24)	(2,512)
Trade accounts payable and accrued liabilities	(5,635)	(12,353)
Deferred revenue	9,262	791
Net cash provided by operating activities	58,512	16,269
Cash flows from investing activities:
Purchases of property and equipment	(11,425)	(11,196)
Purchases of short-term investments	(73,917)	(85,014)
Proceeds from sale/maturity of short-term investments	94,794	109,138
Acquisition of and investments in client contracts	(4,526)	(3,296)
Proceeds from the disposition of business operations		630
Net cash used in investing activities	4,926	10,262
Cash flows from financing activities:
Proceeds from issuance of common stock	740	661
Payment of cash dividends	(11,238)	(10,322)
Repurchase of common stock	(62,861)	(6,584)
Payments on acquired asset financing	(829)	(1,097)
Proceeds from long-term debt	150,000
Payments on long-term debt	(123,750)	(7,500)
Payments of deferred financing costs	(2,692)
Excess tax benefit of stock-based compensation awards	1,809	1,984
Net cash used in financing activities	(48,821)	(22,858)
Effect of exchange rate fluctuations on cash	(1,384)	(237)
Net increase in cash and cash equivalents	13,233	3,436
Cash and cash equivalents, beginning of period	81,712	82,686
Cash and cash equivalents, end of period	94,945	86,122
Cash paid during the period for-
Interest	4,343	4,211
Income taxes	$ 20,761	$ 17,075