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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivatives, Fair Value [Line Items]        
Sale of interest rate swaps $ 0.8      
Interest income (expense) related to the ineffectiveness associated with the fair value hedge     $ 2.7  
Interest rate swap agreement for notional amount       $ 100.0
Interest Rate Swap [Member]        
Derivatives, Fair Value [Line Items]        
Interest expense   $ 0.5    
Unsecured Senior Notes Due 2021 [Member]        
Derivatives, Fair Value [Line Items]        
Stated interest rate on unsecured senior notes   7.125%   7.125%