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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net loss $ (196,696) $ (141,219) $ (171,771)
Other comprehensive income (loss):      
Unrealized gains (losses) on available for sale securities, net of tax of $0, $0, and $0, respectively 0 0 (256)
Change in supplemental executive retirement plan pension liability, net of tax of $0, $0, and $0, respectively (2,309) (2,121) 2,214
Change in pension plan minimum liability, net of tax of $0, $0, and $0, respectively 1,741 (309) 1,919
Change in other benefit plan minimum liability, net of tax of $0, $0 and $0, respectively 0 0 (1,536)
Total comprehensive loss $ (197,264) $ (143,649) $ (169,430)