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Equity - Restricted Stock (Details) - Restricted stock and performance-based stock units - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restricted stock awards    
Number of shares granted 139,112 147,990
Compensation expense related to share-based award $ 1,689,000 $ 1,376,000
Nonvested awards    
Remaining compensation expense 11,808  
2019    
Nonvested awards    
Remaining compensation expense 4,655  
2020    
Nonvested awards    
Remaining compensation expense 4,461  
2021    
Nonvested awards    
Remaining compensation expense 2,503  
2022    
Nonvested awards    
Remaining compensation expense $ 189  
Grant Date Price $45.76 | Three year vesting    
Restricted stock awards    
Number of shares granted 78,276  
Granted (in dollars per share) $ 46.54  
Grant Date Price $45.76 | TSR Targets    
Restricted stock awards    
Number of shares granted 60,836  
Granted (in dollars per share) $ 46.54  
Vesting period 4 years  
Grant Date Price $45.76 | Accelerated TSR Targets    
Restricted stock awards    
Vesting period 3 years  
Grant Date Price $38.18 | Three year vesting    
Restricted stock awards    
Number of shares granted   81,819
Granted (in dollars per share)   $ 38.18
Grant Date Price $38.18 | TSR Targets    
Restricted stock awards    
Number of shares granted   66,171
Granted (in dollars per share)   $ 38.18
Vesting period   4 years
Grant Date Price $38.18 | Accelerated TSR Targets    
Restricted stock awards    
Vesting period   3 years