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Stock Based Compensation (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Restricted stock grants
Jun. 30, 2012
Restricted stock grants
Jun. 30, 2013
Restricted stock grants
Jun. 30, 2012
Restricted stock grants
Jun. 30, 2013
Restricted stock units
Jun. 30, 2012
Restricted stock units
Jun. 30, 2013
Restricted stock units
Jun. 30, 2012
Restricted stock units
Jun. 30, 2013
2012 Incentive Plan
Jun. 30, 2013
Prior Incentive Plans
Jun. 30, 2013
Pay-for-performance program
Sep. 30, 2010
Pay-for-performance program
Restricted stock units
Jun. 30, 2013
Pay-for-performance program
Restricted stock units
Stock Based Compensation                                    
Number of shares authorized for issuance                           600,000        
Shares issued pursuant to plan                           112,650        
Vesting period               5 years                    
Number of share instruments vested since plan's inception                           50        
Number of shares to be vested and issued for each unit outstanding on satisfying performance criteria at June 30, 2017                                   1
Number of shares to be issued for each unit outstanding on not satisfying performance criteria at June 30, 2017                                   0
Outstanding options at the end of the period (in shares) 0 0 0 0 0                          
Summary of the activity of the incentive plans                                    
Restricted share grants               112,650 109,450               200,000  
Average per share grant price (in dollars per share)               $ 21.59 $ 16.77                  
Deferred compensation to be recognized over vesting period               $ 2,432,000 $ 1,835,000                  
Non-vested shares:                                    
Non-vested beginning of period (in shares)           470,015 408,510 407,460 348,385           557,415      
Grants (in shares)               112,650 109,450               200,000  
Vested during period (in shares)               (50,095) (49,325)                 0
Forfeitures (in shares)                                   0
Non-vested end of period (in shares)           470,015 408,510 470,015 408,510           557,415      
Other disclosures                                    
Average per share value of non-vested shares (based on grant price) (in dollars per share)           $ 14.22 $ 12.59 $ 14.22 $ 12.59                  
Value of shares vested during the period (based on grant price)               876,000 1,208,000                  
The total charge to operations for all incentive plans, including the 200,000 Units, is as follows:                                    
Share based compensation charged to operations 369,000 284,000 766,000 586,000   335,000 260,000 702,000 542,000 34,000 24,000 64,000 44,000          
Compensation costs related to nonvested awards that have not yet been recognized $ 4,938,000   $ 4,938,000                         $ 481,000    
Approximate weighted average vesting period     3 years 1 month 6 days