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Equity-based Compensation (Time-Based Restricted Stock Units) (Narrative) (Details) - Equity Plan [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
General and Administrative Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 100,000 $ 2,000,000  
Time-Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period 3 years    
Unrecognized compensation expense $ 4,100,000    
Weighted-average remaining term 2 years 3 months 11 days    
Time-Based Restricted Stock Units [Member] | General and Administrative Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 1,800,000 $ 0 $ 0