Employee Benefit Plans Projected Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 54,061
Fair value of plan assets at end of year	$ 57,825	$ 54,061
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	$ 1,700	1,926
Interest cost	57	68	$ 85
Change in assumptions	(67)	26
Experience gain	(35)	104
Projected benefit obligation at end of year	1,520	1,700	1,926
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	3
Fair value of plan assets at end of year	0	0	3
Employer contributions	205	213
Defined Benefit Plan, Benefit Obligation, Benefits Paid	205	216
Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	89,482	85,363
Service cost (1)	0	0	688
Interest cost	3,053	3,320	3,520
Change in assumptions	(8,051)	5,008
Experience gain	738	(458)
Projected benefit obligation at end of year	79,426	89,482	85,363
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	54,061	48,684
Actual return on plan assets	(3,482)	5,312
Fair value of plan assets at end of year	57,825	54,061	$ 48,684
Employer contributions	13,042	3,800
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ 5,796	$ 3,751