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Earnings per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings per Share    
Income from continuing operations $ 12,976 $ 12,916
Less net income allocated to non-controlling interests   (11)
Less net income allocated to participating securities:    
Nonforfeitable dividends on participating securities (98) (94)
Total net income allocated to participating securities (98) (94)
Less net income allocated to preferred stockholders:    
Preferred stock dividends (818) (818)
Total net income allocated to preferred stockholders (818) (818)
Income from continuing operations available to common stockholders 12,060 11,993
Discontinued operations:    
Gain on sale of assets, net   16
Net income from discontinued operations   16
Net income available to common stockholders 12,060 12,009
Net income for diluted net income per share $ 12,060 $ 12,009
Shares for basic net income per share 30,365 30,189
Effect of dilutive securities:    
Stock options (in shares) 34 45
Shares for diluted net income per share 30,399 30,234
Basic net income per share (in dollars per share) $ 0.40 $ 0.40
Diluted net income per share (in dollars per share) $ 0.40 $ 0.40