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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred income tax expense (benefit), exclusive of the effects of other components listed below $ 9,981 $ 1,085 $ (13,141)
Adjustments to deferred tax assets and liabilities for changes in enacted tax laws and rates 0 (1) 3,144
Tax benefits of operating loss carryforwards (1,130) 0 0
Increase in the beginning-of-the-year balance of the valuation allowance for deferred tax assets 0 5,406 14,478
Deferred income tax expense $ 8,851 $ 6,492 $ 4,481