Employee Benefit Plans Projected Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 57,825
Fair value of plan assets at end of year	$ 83,676	$ 57,825
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of Increase threshold using citigroup average life discount rate table	0.25%
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 1,520	1,700
Interest cost	61	57	$ 68
Benefit payments	(187)	(205)
Change in assumptions	39	(67)
Experience (loss) gain	(17)	(35)
Projected benefit obligation at end of year	1,450	1,520	1,700
Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	79,426	89,482
Interest cost	3,257	3,053	3,320
Benefit payments	(4,114)	(5,796)
Change in assumptions	8,259	(8,051)
Experience (loss) gain	(624)	738
Projected benefit obligation at end of year	86,204	79,426	89,482
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	57,825	54,061
Actual return on plan assets	9,210	(3,482)
Fair value of plan assets at end of year	83,676	57,825	$ 54,061
Employer contributions	$ 20,755	$ 13,042