Employee Benefit Plans Funded Status (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 57,825	$ 54,061
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	(79,426)	(89,482)	$ (85,363)
Fair value of plan assets	57,825	54,061	48,684
Funded status	(21,601)	(35,421)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	(1,520)	(1,700)	(1,926)
Fair value of plan assets	$ 0	$ 0	$ 3