Restatement of Previously Issued Financial Statements (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Restricted cash - current portion	$ 8,733
Accounts Receivable, Net, Current	114,778
Deferred tax assets—current portion	32,063
Prepaid expenses and other current assets	24,584
Total current assets	465,670
Restricted cash - long term portion	652
Goodwill	231,377
Deferred tax assets—long-term portion	258,271
Other non-current assets	20,565
Total non-current assets	705,288
Total Assets	1,170,958
Accrued expenses and other liabilities	73,111
Deferred Revenue, Current	108,217
Total current liabilities	189,068
Deferred Revenue, Noncurrent	8,115
Other non-current liabilities	1,368	284
Total non-current liabilities	290,717
Total Liabilities	479,785
Additional paid-in capital	571,593
Retained earnings	154,551
Accumulated other comprehensive (loss) income	(2,454)
Total stockholders’ equity	691,173
Total liabilities and stockholders’ equity	1,170,958
Scenario, Previously Reported [Member]
Restricted cash - current portion		34,855
Accounts Receivable, Net, Current		102,118
Deferred tax assets—current portion		43,753
Prepaid expenses and other current assets		27,723
Total current assets		380,067
Restricted cash - long term portion		0
Goodwill		226,863
Deferred tax assets—long-term portion		255,386
Other non-current assets		16,367
Total non-current assets		733,461
Total Assets		1,113,528
Accrued expenses and other liabilities		84,256
Deferred Revenue, Current		88,055
Total current liabilities		193,403
Deferred Revenue, Noncurrent		9,090
Other non-current liabilities		0
Total non-current liabilities		296,018
Total Liabilities		489,421
Additional paid-in capital		550,177
Retained earnings		91,732
Accumulated other comprehensive (loss) income		8,980
Total stockholders’ equity		624,107
Total liabilities and stockholders’ equity		1,113,528
Restatement Adjustment [Member]
Restricted cash - current portion		(729)
Accounts Receivable, Net, Current		8,924
Deferred tax assets—current portion		7,063
Prepaid expenses and other current assets		(2,108)
Total current assets		13,150
Restricted cash - long term portion		728
Goodwill		4,514
Deferred tax assets—long-term portion		(323)
Other non-current assets		345
Total non-current assets		5,264
Total Assets		18,414
Accrued expenses and other liabilities		3,772
Deferred Revenue, Current		27,849
Total current liabilities		31,621
Deferred Revenue, Noncurrent		6,385
Other non-current liabilities		284
Total non-current liabilities		6,669
Total Liabilities		38,290
Additional paid-in capital		997
Retained earnings		(19,869)
Accumulated other comprehensive (loss) income		(1,004)
Total stockholders’ equity		(19,876)
Total liabilities and stockholders’ equity		18,414
As Restated [Member]
Restricted cash - current portion		34,126	[1]
Accounts Receivable, Net, Current		111,042	[1]
Deferred tax assets—current portion		50,816	[1]
Prepaid expenses and other current assets		25,615	[1]
Total current assets		393,217	[1]
Restricted cash - long term portion		728	[1]
Goodwill		231,377	[1]
Deferred tax assets—long-term portion		255,063	[1]
Other non-current assets		16,712	[1]
Total non-current assets		738,725	[1]
Total Assets		1,131,942	[1]
Accrued expenses and other liabilities		88,028	[1]
Deferred Revenue, Current		115,904	[1]
Total current liabilities		225,024	[1]
Deferred Revenue, Noncurrent		15,475	[1]
Other non-current liabilities		284	[1]
Total non-current liabilities		302,687	[1]
Total Liabilities		527,711	[1]
Additional paid-in capital		551,174	[1]
Retained earnings		71,863	[1]
Accumulated other comprehensive (loss) income		7,976	[1]
Total stockholders’ equity		604,231	[1]
Total liabilities and stockholders’ equity		$ 1,131,942	[1]

[1] As restated - See Note 23 “Restatement of Previously Issued Financial Statements” of Notes to Consolidated Financial Statements.