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Long-Term Debt - Long-term Debt (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Secured Long-term Debt, Noncurrent $ 0 $ 95,000,000
Indebtedness under revolving credit facility 220,500,000 425,000,000
Convertible Debt, Noncurrent 345,000,000 0
Debt, Long-term and Short-term, Combined Amount 565,500,000 520,000,000
Long-term Debt, Current Maturities 0 10,000,000
Debt Instrument, Unamortized Discount 61,234,000 0
Debt Issuance Costs, Net 7,108,000 772,000
Long-term debt including current maturities $ 497,158,000 $ 509,228,000
Derivative, Number of Instruments Held 3