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Operating Leases (Details Textual)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Operating Leases (Textual) [Abstract]      
Total term of lease facility 30 years    
Initial term of lease facilities 15 years    
Number of additional extensions on lease facility 3    
Extended period of lease under option 5 years    
Future, non-cancelable sublease payments $ 2.4    
Total rent expense under all operating leases $ 53.8 $ 51.5 $ 58.9