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Long-Term Obligations and Commitments, Long-Term Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-Term Obligations [Abstract]    
Long-term mortgage debt $ 59,984 $ 59,913
Leases and other obligations 30,710 17,569
Total 839,574 787,526
Less: current portion (300,462) (2,026)
Total Long-Term Obligations 539,112 785,500
0.125 Percent Convertible Senior Notes [Member]    
Long-Term Obligations [Abstract]    
Convertible senior notes $ 455,719 $ 434,711
Interest rate on convertible senior notes 0.125% 0.125%
1 Percent Convertible Senior Notes [Member]    
Long-Term Obligations [Abstract]    
Convertible senior notes $ 293,161 [1] $ 275,333
Interest rate on convertible senior notes 1.00% 1.00%
[1] We classified the carrying value of our 1% Notes as a current liability on our consolidated balance sheet at December 31, 2020 because it matures in November 2021.