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Income Taxes - U.S. and Foreign Earnings from Continuing Operations before Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]                      
United States                 $ (265,682) $ (968,280) $ (252,376)
Foreign                 58,630 (103,215) 638,125
Earnings (loss) from Cont Ops before taxes $ (41,700) $ 52,200 $ 10,900 $ (228,400) $ (271,800) $ (258,800) $ (511,900) $ (29,000) $ (207,052) $ (1,071,495) $ 385,749