Benefit Plans - Components of Company Plan Benefit Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Change in Projected Benefit Obligation
Projected benefit obligation, beginning of period			$ 37,551	$ 32,474	$ 32,474
Service cost	$ 313	$ 300	940	749	998
Interest cost	326	$ 348	979	1,045	1,393
Actuarial gain			0		3,449
Other reclassification			(8,925)		0
Benefits paid			(563)		(763)
Projected benefit obligation, end of period	29,982		29,982		37,551
Change in Plan Assets
Plan assets at fair value, beginning of period			0	$ 0	0
Company contributions			563		763
Benefits paid			(563)		(763)
Plan assets at fair value, end of period	0		0		0
Unfunded Status of the Plan	$ 29,982		$ 29,982		$ 37,551