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Dividends - Dividend Payments (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Dividends [Abstract]          
Cash dividend paid per common share (in dollars per share) $ 0.17375 $ 0.17250 $ 0.17125    
Total cash dividends paid $ 12,335 $ 12,186 $ 12,077 $ 36,598 $ 34,760
Record date Aug. 22, 2014 May 23, 2014 Feb. 21, 2014    
Payment date Sep. 26, 2014 Jun. 27, 2014 Mar. 28, 2014