Goodwill and Intangible Assets - Finite-lived Intangible Assets Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Finite-lived Intangible Assets, Gross [Roll Forward]
Intangible assets, January 1	$ 35,240	$ 35,240	$ 35,240
Additions	0
Total intangible assets, end of year	35,240		35,240
Accumulated Amortization [Roll Forward]
Accumulated amortization, January 1	(29,985)	(27,345)	(27,345)
Current year amortization	(516)	$ (658)	(2,640)
Total accumulated amortization	(30,501)		(29,985)
Net intangible assets
Net intangible assets, end of year	4,739		5,255
Infinite-lived intangible assets	6,892		6,892
Total net intangible assets	$ 11,631		$ 12,147