Employee Benefit Obligations - Net Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Change in Benefit Obligation
Projected benefit obligation at beginning of year	$ 12,249	$ 10,317
Interest cost	114	64
Company service cost	932	820
Employee contributions	599	486
Prior service cost	0	0
Benefits paid	109	475
Actuarial loss	1,900	87
Projected benefit obligation at end of year	15,685	12,249
Change in Plan Assets
Fair value of plan assets at beginning of year	9,936	8,243
Actual return on plan assets	1,031	3
Employer contributions	899	729
Employee contributions	599	486
Benefits paid	109	475
Fair value of plan assets at end of year	12,356	9,936
Funded Status at End of year
Excess of obligation over assets			$ (3,329)	$ (2,313)
Change in Accrued Benefit Liability
Accrued benefit liability at beginning of year	(2,313)	(2,074)
Company contributions made during year	899	729
Net periodic benefit cost for year	(1,024)	(874)
Net decrease (increase) in accumulated other comprehensive loss	(891)	(94)
Accrued benefit liability at end of year	(3,329)	(2,313)
Non-current plan assets			12,357	9,936
Non-current liability			15,686	12,249
Accrued benefit liability at end of year	$ (3,329)	$ (2,074)	(3,329)	(2,313)
Projected Benefit Payments
Projected year 1			270	206
Projected year 2			1,434	205
Projected year 3			255	1,158
Projected year 4			260	195
Projected year 5			571	200
Projected years 6-10			$ 2,109	$ 2,859