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Stock Based Compensation (Details) (USD $)
 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Restricted stock grants
Mar. 31, 2013
Restricted stock grants
Mar. 31, 2014
Restricted stock units
Mar. 31, 2013
Restricted stock units
Mar. 31, 2014
2012 Incentive Plan
Mar. 31, 2014
Prior Incentive Plans
Mar. 31, 2014
Pay-for-performance program
Sep. 14, 2010
Pay-for-performance program
Restricted stock units
Mar. 31, 2014
Pay-for-performance program
Restricted stock units
Stock Based Compensation                        
Number of shares authorized for issuance               600,000        
Shares issued pursuant to plan               229,000        
Vesting period       5 years                
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                  
Summary of the activity of the incentive plans                        
Restricted share grants       118,850 112,650           200,000  
Per share grant price (in dollars per share)       $ 20.54 $ 21.59              
Deferred compensation to be recognized over vesting period       $ 2,441,000 $ 2,432,000              
Non-vested shares:                        
Non-vested beginning of period (in shares)       470,015 407,460       452,000      
Grants (in shares)       118,850 112,650           200,000  
Vested during period (in shares)       (101,300) (50,095)             0
Forfeitures (in shares)       (6,520)               0
Non-vested end of period (in shares)       481,045 470,015       452,000      
Other disclosures                        
Average per share value of non-vested shares (based on grant price) (in dollars per share)       $ 14.55 $ 14.22              
Value of shares vested during the period (based on grant price)       621,000 876,000              
The total charge to operations for all incentive plans, including the 200,000 Units, is as follows:                        
Share based compensation charged to operations 472,000 397,000   443,000 367,000 29,000 30,000          
Compensation costs related to nonvested awards that have not yet been recognized $ 6,188,000                 $ 372,000    
Approximate weighted average vesting period 3 years 1 month 6 days