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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]      
Foreign currency translation adjustment, tax $ 0 $ 0 $ 0
Unrealized gain on derivative instruments, tax 0 0 0
Minimum pension liability adjustment, tax 0 0 (144)
Net Income (Loss) $ (618,702) 937,664 370,930
Unrealized loss on derivatives, net of tax of $0   $ (7,950) $ 13,709