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Net Income Per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net Income Per Common Share                      
Income from continuing operations                 $ 55,405 $ 50,306 $ 48,620
Less net income allocated to non-controlling interests                   (37) (191)
Less net income allocated to participating securities:                      
Nonforfeitable dividends on participating securities                 (381) (377) (342)
Income allocated to participating securities                 (2)    
Total net income allocated to participating securities                 (383) (377) (342)
Less net income allocated to preferred stockholders:                      
Preferred stock dividends                 (3,272) (3,273) (5,512)
Preferred stock redemption charge                     (3,566)
Total net income allocated to preferred stockholders                 (3,273) (3,273) (9,078)
Income from continuing operations available to common stockholders                 51,749 46,619 39,009
Discontinued operations:                      
Income from discontinued operations                 805 1,005 823
Gain on sale of assets, net                 1,605 16  
Net income (loss) from discontinued operations   2,857 (701) 254 254 253 251 263 2,410 1,021 823
Net income available to common stockholders 13,732 16,373 11,994 12,060 11,854 11,583 12,194 12,009 54,159 47,640 39,832
Net income for diluted net income per share                 $ 54,159 $ 47,640 $ 39,832
Shares for basic net income per share                 33,111 30,238 29,194
Effect of dilutive securities:                      
Stock options (in shares)                 31 40 28
Total effect of dilutive securities (in shares)                 31 40 28
Shares for diluted net income per share                 33,142 30,278 29,222
Basic net income per share (in dollars per share) $ 0.40 $ 0.47 $ 0.36 $ 0.40 $ 0.39 $ 0.38 $ 0.40 $ 0.40 $ 1.64 [1] $ 1.58 [1] $ 1.36 [1]
Diluted net income per share (in dollars per share) $ 0.40 $ 0.47 $ 0.36 $ 0.40 $ 0.39 $ 0.38 $ 0.40 $ 0.40 $ 1.63 [1] $ 1.57 [1] $ 1.36 [1]
[1] NOTE: Computations of per share amounts from continuing operations, discontinued operations and net income are made independently. Therefore, the sum of per share amounts from continuing operations and discontinued operations may not agree with the per share amounts from net income available to common stockholders.