Employee Benefits (Defined Benefit Plan, Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Retirement Income Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities	$ 0	$ 0
Noncurrent liabilities	(62,693)	(57,600)
Total	(62,693)	(57,600)
Other Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities	(2,153)	(2,154)
Noncurrent liabilities	(24,566)	(26,238)
Total	(26,719)	(28,392)
Other Postretirement Benefit Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities	0	0
Noncurrent liabilities	(24,575)	(26,417)
Total	$ (24,575)	$ (26,417)