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Commitments And Contingencies (Supplemental Cash Flow Information Related To Operating Leases) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Commitments And Contingencies [Abstract]        
Operating cash flows from operating leases $ 5,136 $ 4,977 $ 15,004 $ 15,913
Right-of-use assets obtained in exchange for lease obligations: Operating leases 11,053 4,427 17,932 10,634
Right-of-use assets and lease obligations derecognized due to lease modifications: Operating leases $ 12 $ 1,405 $ 12 $ 1,405