Restricted Cash (Schedule Of Cash, Cash Equivalents And Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Cash [Abstract]
Cash and cash equivalents	$ 146,109	$ 118,039	$ 39,443
Restricted cash - short term	36,786	25,353	52,519
Restricted cash - long term	3,075	3,227	5,934
Total cash, cash equivalents, and restricted cash	$ 185,970	$ 146,619	$ 97,896	$ 178,408