CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 72,129	$ 38,158
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on note receivable	0	22,556
Depreciation and amortization	19,212	19,434
Non-cash, stock-based compensation	9,577	9,936
Provision for doubtful accounts and sales credits	1,196	2,174
Gain on sale of business, net of tax	(34,895)	(2,286)
Amortization of discount on note receivable	0	(570)
Deferred income taxes	(3,075)	2,745
Tax benefit from stock-based awards	2,412	2,831
Excess tax benefit from stock-based awards	(2,478)	(2,986)
Changes in operating assets and liabilities, excluding business acquisitions	31,245	(12,523)
Net cash provided by operating activities	95,323	79,469
Cash flows from investing activities:
Purchases of property and equipment	(6,666)	(6,019)
Principal payments received on note receivable	0	1,960
Proceeds from the sale of business, net of cash divested	72,813	0
Payments for acquisitions, net of cash acquired	(24,286)	0
Net cash (used in) provided by investing activities	41,861	(4,059)
Cash flows from financing activities:
Proceeds from borrowings under credit agreement	115,000	25,000
Repayments under credit agreement	(190,000)	(65,000)
Repurchases and retirement of common stock	(81,069)	(52,079)
Proceeds from shares issued under employee stock programs	3,836	6,349
Excess tax benefit from stock-based awards	2,478	2,986
Net cash used in financing activities	(149,755)	(82,744)
Effect of exchange rate changes on cash and cash equivalents	(107)	(2,236)
Effect on cash and cash equivalents from discontinued operations	14,933	0
Net (decrease) increase in cash and cash equivalents	2,255	(9,570)
Cash and cash equivalents, beginning of period	81,319	136,638
Cash and cash equivalents, end of period	$ 83,574	$ 127,068