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Current and Long-Term Debt - Convertible Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Nov. 19, 2013
Long-Term Debt              
Loss on extinguishment   $ 3,000,000.0 $ 3,018,000 $ 0 $ 6,408,000    
Convertible Notes              
Long-Term Debt              
Interest rate     1.00% 1.00%     1.00%
Face amount of debt issuance       $ 287,500,000     $ 287,500,000
Fair value of debt component             $ 215,800,000
Effective interest rate percentage     5.26%        
Repurchased amount           $ 171,900,000  
Repayment of debt $ 115,600,000            
Repayment of interest $ 600,000            
Conversion price (in dollars per share)             $ 52.35
Adjusted conversion price (in dollars per share)     $ 73.29        
Settlement amount   $ 1,000,000.0          
Convertible Notes | Common Share Warrants              
Long-Term Debt              
Warrants outstanding (in shares)     2,200,000        
Warrant strike price (in dollars per share)     $ 73.29