Operating Leases - Operating lease income and expense and other supplemental information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating Lease Income and Expense
Operating lease cost	$ 5,067
Variable lease cost	449
Short-term lease cost	136
Total lease cost	5,652
Sublease income and rental income from owned properties under operating leases	$ 1,160