Employee Benefit Plans (Pension Plan Assets Fair Value Measurement Reconciliation of Unobservable Inputs) (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance as of January 1	$ 127	$ 1,990
Distributions	(127)	(1,962)
Unrealized gain on long-term investments	0	15
Realized gain on long-term investments	0	84
Balance as of December 31	$ 0	$ 127