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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Taxes        
Provision for (benefit of) income taxes $ 5,184 $ 2,552 $ 6,534 $ 630
Effective tax rate 41.70% 49.60% 42.90% 75.80%
U.S. federal statutory tax rate     35.00% 35.00%