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Commitments and Contingent Liabilities - (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 109 Months Ended
May 31, 2016
Jan. 31, 2015
Jan. 31, 2015
Jun. 29, 2015
Dec. 31, 2005
Loss Contingencies [Line Items]          
Amount paid on contract     $ 20.0    
District of Maryland          
Loss Contingencies [Line Items]          
Annual interest amount       $ 13.7  
District of Maryland | Judicial Ruling          
Loss Contingencies [Line Items]          
Purchase price in litigation   $ 114.0      
Litigation interest rate   12.00% 12.00% 12.00%  
District of Maryland | Pending Litigation | Surety Bond          
Loss Contingencies [Line Items]          
Outstanding surety bonds       $ 223.4  
District of Maryland | Interest          
Loss Contingencies [Line Items]          
Damages sought $ 109.0        
District of Maryland | Real Estate Taxes          
Loss Contingencies [Line Items]          
Damages sought 1.6        
Original Contract          
Loss Contingencies [Line Items]          
Purchase price         $ 200.0
Renegotiated Contract          
Loss Contingencies [Line Items]          
Purchase price $ 134.0