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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings per Share        
Income from continuing operations $ 14,429 $ 12,251 $ 40,755 $ 37,785
Less net income allocated to non-controlling interests   (9)   (30)
Less net income allocated to participating securities:        
Nonforfeitable dividends on participating securities (93) (94) (282) (279)
Allocation of undistributed income to participating securities (2)   (2)  
Total net income allocated to participating securities (95) (94) (284) (279)
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 13,516 11,330 38,017 35,022
Discontinued operations:        
Net income from discontinued operations 238 253 805 748
Gain on sale of assets, net 2,619   1,605 16
Net income from discontinued operations 2,857 253 2,410 764
Net income available to common stockholders 16,373 11,583 40,427 35,786
Effect of dilutive securities:        
Convertible preferred securities 818   2,454  
Net income for diluted net income per share $ 17,191 $ 11,583 $ 42,881 $ 35,786
Shares for basic net income per share 34,553 30,253 32,625 30,219
Effect of dilutive securities:        
Stock options (in shares) 27 40 32 44
Convertible preferred securities (in shares) 2,000   2,000  
Shares for diluted net income per share 36,580 30,293 34,657 30,263
Basic net income per share (in dollars per share) $ 0.47 $ 0.38 $ 1.24 $ 1.18
Diluted net income per share (in dollars per share) $ 0.47 $ 0.38 $ 1.24 $ 1.18