Cash Flow Information - Cash and Restricted Cash (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 15,227	$ 18,084	$ 42,198
Restricted cash included in other assets	11,305		14,572
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$ 26,532	$ 32,445	$ 56,770	$ 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.