Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities
Net income	$ 30,472	$ 6,583	$ 33,220
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,164	32,241	16,995
Provision for doubtful accounts and sales returns	5,403	9,591	5,646
Stock-based compensation expense	16,910	19,240	14,884
Excess tax benefits from stock-based compensation	0	(81)	(932)
Deferred taxes	13,873	7,585	13,533
Impairment of cost method investment	0	200	1,800
Gain on sale of assets	0	0	(549)
Amortization of deferred financing costs	613	678	164
Other non-cash adjustments	1,261	(293)	(1,042)
Changes in operating assets and liabilities, net of acquisition of businesses:
Accounts receivable	3,161	(9,397)	(8,692)
Prepaid expenses and other assets	2,977	(8,817)	(2,915)
Trade accounts payable	(218)	(1,363)	1,714
Accrued expenses and other liabilities	(17,055)	(388)	(1,056)
Donor restricted cash	(39,801)	(27,990)	(22,862)
Donations payable	39,801	27,990	22,862
Deferred revenue	6,683	12,912	12,757
Net cash provided by operating activities	107,244	68,691	85,527
Cash flows from investing activities
Purchase of property and equipment	(20,086)	(20,557)	(18,215)
Purchase of net assets of acquired companies, net of cash acquired	(876)	(280,687)	(23,385)
Capitalized software development costs	(3,197)	(1,245)	(1,012)
Proceeds from sale of assets	0	0	874
Net cash used in investing activities	(24,159)	(302,489)	(41,738)
Cash flows from financing activities
Proceeds from issuance of debt	103,008	315,000	0
Payments on debt	(165,600)	(99,500)	0
Payments of deferred financing costs	0	(2,440)	(767)
Proceeds from exercise of stock options	385	3,146	2,041
Excess tax benefits from stock-based compensation	0	81	932
Dividend payments to stockholders	(22,081)	(21,731)	(21,429)
Payments on capital lease obligations	0	0	(40)
Net cash (used in) provided by financing activities	(84,288)	194,556	(19,263)
Effect of exchange rate on cash and cash equivalents	(399)	213	(10)
Net (decrease) increase in cash and cash equivalents	(1,602)	(39,029)	24,516
Cash and cash equivalents, beginning of year	13,491	52,520	28,004
Cash and cash equivalents, end of year	11,889	13,491	52,520
Supplemental disclosure of cash flow information
Cash (paid) received for interest	(5,108)	(5,098)	(2)
Cash (paid) received for taxes, net of refunds	4,132	(3,456)	4,601
Purchase of equipment included in accounts payable	$ (1,557)	$ (4,641)	$ (4,760)