Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Income Tax Contingency [Line Items]
Income Tax Reconciliation, State Net Operating Loss Carry Forward Utilization Benefit and Valuation Allowance Release	$ 0	$ 0	$ 2,402	$ 2,178
Unrecognized Tax Benefits	131,351		131,351
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	79,799		79,799
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense			0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 0		$ 0		$ 0
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Effective Income Tax Rate, Continuing Operations	4.10%	24.70%	13.70%	24.80%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate			35.00%
Years remaining subject to examination by the Internal Revenue Service			from 2000 forward