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Stock Compensation - Long-Term Incentive Plan Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2011
Sep. 30, 2018
Nov. 30, 2015
Sep. 30, 2014
Sep. 30, 2018
Mar. 31, 2016
Mar. 31, 2017
2019 LTIP PSUs | 2015 SIP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period (in years)       3 years          
Award requisite service period       36 months          
Granted (in shares)             41,793    
Granted (in dollars per share)             $ 120.24    
2016 LTIP PSUs | 2015 SIP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period (in years)         3 years        
Award requisite service period         36 months        
Granted (in dollars per share)               $ 50.05  
2015 LTIP PSUs | Equity Incentive Plans 2006                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period (in years)           3 years      
Granted (in dollars per share)           $ 98.29      
Compensation expenses                 $ 1,400
2007 LTIP SARs and 2007 LTIP PSUs | Equity Incentive Plans 2006                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expenses                 $ 2,400
Vesting portion tranche one     50.00%            
Vesting portion tranche two     50.00%            
Maximum | 2019 LTIP PSUs | 2015 SIP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting rights percentage       200.00%          
Maximum | 2016 LTIP PSUs | 2015 SIP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting rights percentage         200.00%        
Granted (in shares)               308,000  
Maximum | 2015 LTIP PSUs | Equity Incentive Plans 2006                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (in shares)           160,000      
Minimum | 2019 LTIP PSUs | 2015 SIP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Financial performance achievement percentage       90.00%          
Minimum | 2016 LTIP PSUs | 2015 SIP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Financial performance achievement percentage         90.00%        
Vesting December 2015 | 2007 LTIP SARs and 2007 LTIP PSUs | Equity Incentive Plans 2006                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting rights percentage   80.00%              
Vesting December 2016 | 2007 LTIP SARs and 2007 LTIP PSUs | Equity Incentive Plans 2006                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting rights percentage 20.00%