Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating Activities:
Net income	$ 26,355
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,932
Provision for doubtful accounts	204
Amortization of loan fees	1,853
Net gain on disposal of property and equipment	74
Stock-based compensation	8,716	12,161
Deferred income taxes	9,603
Changes in operating assets and liabilities:
Accounts receivable	18,927
Prepaid expenses and other assets	(1,967)
Accounts payable	488
Accrued expenses and other liabilities	3,329
Deferred revenue	5,640
Net cash provided by operating activities	118,154
Investing Activities:
Change in restricted cash	5,971
Purchase of property and equipment	(8,875)
Proceeds from disposal of property and equipment	397
Net cash used in investing activities	(2,507)
Financing Activities:
Issuance of common stock	2,399
Purchase of treasury stock	(3,270)
Proceeds from bank advances	7,090
Debt issuance costs	0
Conversion of warrants	0
Net cash provided by (used in) financing activities	6,219
Effect of exchange rates on cash and cash equivalents	906
Net increase in cash and cash equivalents	122,772
Cash and Cash Equivalents, Beginning of Period	285,512
Cash and Cash Equivalents, End of Period	408,284
Supplemental Disclosures of Cash Flow Information:
Cash paid for income taxes	6,887
Cash paid for interest	11,356
Cash received for income tax refunds	1,878
Capital expenditures incurred but not yet paid	2,798
As Restated [Member]
Operating Activities:
Net income		79,113	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		44,261	[1]
Provision for doubtful accounts		0	[1]
Amortization of loan fees		1,739	[1]
Net gain on disposal of property and equipment		24	[1]
Stock-based compensation		12,161	[1]
Deferred income taxes		18,566	[1]
Changes in operating assets and liabilities:
Accounts receivable		(16,796)	[1]
Prepaid expenses and other assets		(2,974)	[1]
Accounts payable		(14,957)	[1]
Accrued expenses and other liabilities		659	[1]
Deferred revenue		8,245	[1]
Net cash provided by operating activities		130,041	[1]
Investing Activities:
Change in restricted cash		(2,293)	[1]
Purchase of property and equipment		(7,625)	[1]
Proceeds from disposal of property and equipment		51	[1]
Net cash used in investing activities		(9,867)	[1]
Financing Activities:
Issuance of common stock		5,261	[1]
Purchase of treasury stock		(5,166)	[1]
Proceeds from bank advances		0	[1]
Debt issuance costs		(1,727)	[1]
Conversion of warrants		671	[1]
Net cash provided by (used in) financing activities		(961)	[1]
Effect of exchange rates on cash and cash equivalents		(1,173)	[1]
Net increase in cash and cash equivalents		118,040	[1]
Cash and Cash Equivalents, Beginning of Period		171,618	[1]
Cash and Cash Equivalents, End of Period		289,658	[1]
Supplemental Disclosures of Cash Flow Information:
Cash paid for income taxes		9,709	[1]
Cash paid for interest		11,029	[1]
Cash received for income tax refunds		1,320	[1]
Capital expenditures incurred but not yet paid		$ 68	[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.