Employee Benefit Plans (Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 31,776	$ 39,369	$ 39,826
Excess of projected benefit obligation over the fair value of plan assets	(13,524)	(17,570)
Aggregate accumulated benefit obligation (ABO)	45,300	56,939
Noncurrent asset	(393)	0
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	(13,131)	(17,570)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(21,640)	(29,263)
Prior service cost	0	0
Defined Benefit Plan, Amortization of Net Gains (Losses)	594
Prior service cost	0
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Aggregate accumulated benefit obligation (ABO)	39,886	51,395
Supplemental Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Aggregate accumulated benefit obligation (ABO)	$ 5,414	$ 5,544