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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation $ 140,442 $ 135,850  
Defined Benefit Plan, Amortization of Net Gains (Losses) 3,900    
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 1,700    
Defined Contribution Plan, Cost Recognized 9,000 7,800 $ 7,300
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost 13,098 10,710 12,004
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 14,300    
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost 9,099 $ 5,376 $ 4,102
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 6,600    
Equity Securities [Member]      
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 60.00%    
Debt Securities [Member]      
Defined Benefit Plan Change In Benefit Obligation [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 40.00%