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Equity-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2016
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
shares
Jun. 30, 2014
USD ($)
shares
Jan. 31, 2014
USD ($)
shares
Jan. 31, 2013
USD ($)
shares
Dec. 31, 2015
USD ($)
payment
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
May. 07, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Typical vesting period, in years             4 years      
Number of shares available for issuance under the Plan   691,000         691,000      
Granted             37,500 0 0  
Number of restricted stock units credited to participant accounts             519,668 647,371    
Market price of common stock, per share | $ / shares   $ 25.44         $ 25.44      
Requisite vesting age             60 years      
Intrinsic value of options exercisable | $   $ 4,065         $ 4,065      
Weighted average remaining life of options exercisable             3 years 5 months 1 day      
Unrecognized compensation cost | $   $ 12,479         $ 12,479      
Weighted average cost recognition period, in years             2 years 9 months 18 days      
Performance Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of target performance stock units earned                 50.00%  
Targeted performance stock units                 237,000  
Performance stock units outstanding   237,000         237,000      
Shares awarded       19,000 212,000 304,000        
Performance stock unit grant-date fair value | $       $ 319 $ 3,914 $ 4,123        
Performance stock units earned                 114,000  
Service period             5 years      
Closing price period for determination of cash conversion             90 days      
Management Stock Purchase Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Closing price period for determination of cash conversion             200 days      
Weighted average fair value of per unit awarded | $ / shares             $ 19.95 $ 15.68    
Number of restricted stock units credited to participant accounts             94,047 119,105 132,037  
Accrues interest             2.00%      
Lump sum payment option one | payment             1      
Lump sum payment option two | payment             5      
Lump sum payment option three | payment             10      
Maximum | Performance Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance stock unit vesting period             3 years      
Minimum | Performance Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance stock unit vesting period             1 year      
Performance Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance stock units outstanding   396,714         396,714 0    
Shares awarded             396,714 0 0  
Weighted average fair value of per unit awarded | $ / shares             $ 19.78 $ 0.00 $ 0.00  
Unvested Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of restricted stock units credited to participant accounts             59,091 62,455    
2015 Equity Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Maximum number of shares that may be issued under the Plan                   1,250,000
2015 Equity Incentive Plan | Performance Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period   3 years                
Shares awarded   75,000 321,714              
2015 Equity Incentive Plan | Performance Shares | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Percentage of target performance stock units earned 200.00%                  
Targeted performance stock units 219,000                  
Shares awarded 219,000                  
Performance stock units earned 438,000                  
Weighted average fair value of per unit awarded | $ / shares $ 4,039,000                  
2005 Equity Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Maximum number of shares that may be issued under the Plan                   274,374