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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Percentage of taxable income distributed to shareholders     90.00%  
Income tax expense $ 2,275 $ 4,212 $ 6,857 $ 6,848