Commitments and Contingencies (Operating Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Future minimum lease payments under operating leases
2020	$ 2,012
2021	1,962
2022	1,916
2023	1,976
2024	2,017
Thereafter	23,692
Total lease payments	33,575
Rent expense	$ 2,900
Rent expense under operating leases		$ 2,900	$ 3,300