Restatement of Previously Issued Financial Statements Cash Flow Restatement (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011 Scenario, Previously Reported [Member]	Jun. 30, 2011 Scenario, Adjustment [Member]	Jun. 30, 2011 As Restated [Member]
NET INCOME (LOSS)	$ 15,304	$ 55,647	$ 5,179	$ 60,826	[1]
Deferred income taxes	4,997	4,379	2,586	6,965	[1]
Accounts receivable	(11,373)	(24,890)	2,978	(21,912)	[1]
Prepaid expenses and other assets	86	(9,861)	5,083	(4,778)	[1]
Accounts payable	1,777	(11,861)	(40)	(11,901)	[1]
Accrued expenses and other liabilities	1,194	(2,307)	(4,653)	(6,960)	[1]
Deferred revenue	29,905	42,124	(12,179)	29,945	[1]
Net cash provided by operating activities	77,724	94,160	(1,046)	93,114	[1]
Payment of direct costs related to acquisitions		(1,703)	1,703	0
Net cash (used in) provided by investing activities	928	(8,724)	1,703	(7,021)	[1]
Net increase in cash and cash equivalents	76,918	84,483	657	85,140	[1]
Cash and Cash Equivalents, End of Period	$ 362,430	$ 256,101	$ 657	$ 256,758	[1]

[1] (1) As restated - See Note 14 “Restatement of Previously Issued Financial Statements” of Notes to Condensed Consolidated Financial Statements.See notes to Condensed Consolidated Financial Statements.