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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements   $ (40,999)
Estimated future benefit payments for defined-benefit plans        
Defined benefit pension plans     (19,400) $ (10,200)
Contributions to employee benefits plan   $ 3,300 3,200 3,000
Discretionary contributions to employee benefit plan   $ 5,000 5,600 4,900
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Contributions for plan     $ 7,500 $ 3,000
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%