Employee Benefit Plans Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Retirement plan and pension plan, total	$ 11,460	$ 11,917	$ 12,289
Amount to be amortized from accumulated other comprehensive income (loss) in next twelve months	2,100
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Pension Plan	(495)	(502)	(497)
Other Postretirement Benefit Plan | 401k Plan
Defined Benefit Plan Disclosure [Line Items]
401(k) Retirement Plan	$ 8,976	8,482	8,121
Maximum percentage of eligible employee’s covered compensation	5.00%
Percentage of plan vested	100.00%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension Plan	$ 2,484	$ 3,435	$ 4,168