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Employee Benefit Plans (Defined Benefit Pension Plan Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Pension contributions $ 0 $ 0
Amount included in accumulated other comprehensive income not yet recognized as components of net periodic benefit cost $ 27,300,000 $ 16,900,000
Other Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Benefits payable calculation, highest earnings service period (in years) 5 years  
Benefits payable calculation, service period (in years) 10 years  
Age limit for early retirement of participants under cash balance plan 55 years  
Completion period of credited service for participants under cash balance plan 10 years  
Years of consecutive service to be eligible to retire with full benefits 35 years  
Minimum employee retirement age to receive full benefits 62 years  
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Term of obligation based on expected retirement dates (in years) 8 years  
Average long-term rate of return, company goal 5.56%