Cash Flow Information - Cash and Restricted Cash (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 11,709	$ 18,084	$ 19,294
Restricted cash included in other assets	6,183		12,730
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$ 17,892	$ 32,445	$ 32,024	$ 33,953
Additional cash and cash equivalent related text	Our restricted cash consists of cash held in escrow by banks for real estate taxes and other purposes.