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Common Share Capitalization (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended 35 Months Ended
Aug. 04, 2011
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Dividend
Jun. 30, 2013
Dividend
Jun. 30, 2014
Common Stock Capitalization [Line Items]            
Number of Dividends Authorized       2 2  
Common Shares Issued And Outstanding Upon Conversion of All Convertible Securities   26,064,802 26,021,107 26,064,802 26,021,107 26,064,802
Shareholders Equity Per Share Upon Conversion Of All Convertible Units (in usd per share)   $ 24.14 $ 24.51 $ 24.14 $ 24.51 $ 24.14
Dividends (in usd per share)   $ 0.77 $ 0.77 $ 1.54 $ 2.29  
Payments of Dividends   $ (20,100,000) $ (20,000,000) $ (40,140,000) $ (51,976,000)  
Aggregate cost of shares repurchase 10,000,000          
Shares repurchased           (217,619)
Aggregate cost of shares repurchased           $ 4,500,000
Average price per share repurchased (in usd per share)           $ 20.59