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Income Taxes - Tax Benefits (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]  
Balance at January 1, 2012 $ 3,180
Additions for tax positions related to current year 578
Additions for tax positions of prior years 0
Reductions for tax position of prior years 0
Balance at June 30, 2012 3,758
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 816