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Stock Based Compensation (Details Textual) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percent of cash proceeds received if units granted, internal rate of return 15.00%  
Number of shares authorized 15.0  
Reversal of previously recognized equity compensation expense $ 2.6  
Share-based compensation (benefit)/expense (1.6) $ 12.9
Compensation cost not yet recognized $ 14.7  
Weighted average remaining contractual term 2 years 3 months 18 days  
General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity based compensation expense   $ 9.9
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Service period 1 year  
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Service period 5 years  
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period 0.4 0.7