v2.4.0.6
Income Tax (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of differences between the provision for income taxes and income taxes computed using the federal income tax rate      
Amount computed using the statutory rate $ 10,282 $ 26,668 $ 7,847
State income taxes, net of federal tax benefit 463 990 263
Qualified domestic production activity deduction (1,522) (1,511) (1,198)
Other items 342 (83) 217
Total Income Tax Expense $ 9,565 $ 26,064 $ 7,129