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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements       $ (40,999)
Other comprehensive income, net of deferred taxes       19,379
Estimated future benefit payments for defined-benefit plans        
Defined benefit pension plans       (19,400)
Expenses related to employee benefits plan   $ 3,700 $ 3,300 3,200
Discretionary contributions to employee benefit plan   $ 6,000 $ 5,000 5,600
Defined Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements $ (41,000)      
Percentage of vested pension benefits   100.00%    
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Contributions for plan       $ 7,500