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, 2016	Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Balance as of January 1	$ 3,414	$ 6,824
Distributions	(1,648)	(2,904)
Unrealized gain (loss) on long-term investments	16	(470)
Realized gain (loss) on long-term investments	208	(36)
Balance as of December 31	$ 1,990	$ 3,414