Cash Flow Disclosures And Non Cash Investing And Financing Activities (Reconciliation of Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 27,012	$ 32,598	$ 17,945
Escrowed cash	9,973	8,185	7,641
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$ 36,985	$ 40,783	$ 25,586	$ 194,637