XML 123 R74.htm IDEA: XBRL DOCUMENT v3.20.1
Revenue Recognition (Schedule Of Breakout Of The Company's Derived Revenue And Other Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue Recognition [Abstract]      
Revenue from contracts with customers $ 218,227 $ 168,938 $ 154,069
Interest income 21 103 92
Cost recovery income 417   604
Dividend income 18   43
Total revenue $ 218,683 $ 169,041 $ 154,808