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Stock-Based Compensation (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
award
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
award
shares
Sep. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense | $ $ 403 $ 3,300 $ 6,400 $ 7,900
Number of stock options exercised (in shares)     457,206  
Value of stock issued during period resulting from exercise of stock options | $     $ 945  
Board of Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense | $     $ 1,100  
Number of shares issued in lieu of fees     118,555  
Restricted Stock | Key Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     315,199  
Vesting period     3 years  
Performance-based RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Types of performance-based RSUs | award 2   2  
Ultimate payout, minimum (as a percent)     0.00%  
Ultimate payout, maximum (as a percent)     200.00%  
Number of trading days used to determine average closing price     30 days  
TSR RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     315,124  
FFO RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares granted     135,054  
Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of stock issued during period (in shares)     47,309