Cash Flow Disclosures And Non Cash Investing And Financing Activities (Reconciliation of Cash) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash and Cash Equivalents	$ 36,780	$ 32,598	$ 46,869
Escrowed cash	10,767	8,185	7,063
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$ 47,547	$ 40,783	$ 53,932	$ 25,586