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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract] |  |
Net loss | $ (18,524) | $ (21,286)
Other comprehensive income: |  |
Change in pension plan and supplemental pension plan liability, net of tax of $0 and $0, respectively | 369 |
Total comprehensive loss | $ (18,155) | $ (21,286)

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