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Equity-Based Compensation (Performance Stock Units - Settled in Cash) (Details) - Performance stock units - shares
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Typical vesting period, in years 3 years    
Performance period 1 year    
PSUs earned 256,000 128,000  
Percentage of target performance stock units earned   200.00% 200.00%
Aggregate shares earned (in shares)     438,000
Targeted award (in shares)     219,000