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Earnings per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings per Share        
Income from continuing operations $ 17,122 $ 14,429 $ 52,399 $ 40,755
Less net income allocated to participating securities:        
Nonforfeitable dividends on participating securities (123) (93) (343) (282)
Allocation of undistributed income to participating securities   (2)   (2)
Total net income allocated to participating securities (123) (95) (343) (284)
Less net income allocated to preferred stockholders:        
Preferred stock dividends (818) (818) (2,454) (2,454)
Total net income allocated to preferred stockholders (818) (818) (2,454) (2,454)
Income from continuing operations available to common stockholders 16,181 13,516 49,602 38,017
Discontinued operations:        
Income from discontinued operations   238   805
Gain on sale of real estate, net   2,619   1,605
Net income from discontinued operations   2,857   2,410
Net income available to common stockholders 16,181 16,373 49,602 40,427
Effect of dilutive securities:        
Convertible preferred securities 818 818 2,454 2,454
Net income for diluted net income per share $ 16,999 $ 17,191 $ 52,056 $ 42,881
Shares for basic net income per share 34,605 34,553 34,596 32,625
Effect of dilutive securities:        
Stock options (in shares) 24 27 24 32
Convertible preferred securities (in shares) 2,000 2,000 2,000 2,000
Shares for diluted net income per share 36,629 36,580 36,620 34,657
Basic net income per share (in dollars per share) $ 0.47 $ 0.47 $ 1.43 $ 1.24
Diluted net income per share (in dollars per share) $ 0.46 $ 0.47 $ 1.42 $ 1.24