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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Shares
Capital in Excess of Par Value
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018   173,530,000      
Beginning balance at Dec. 31, 2018 $ 1,717,575 $ 17 $ 3,147,925 $ (6,316) $ (1,424,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued under equity compensation plans (in shares) 20,000 698,000      
Shares issued under equity compensation plans $ 5,463   5,463    
Stock-based compensation 25,385   25,385    
Comprehensive loss (114,912)     4,720 (119,632)
Ending balance (in shares) at Mar. 31, 2019   174,228,000      
Ending balance at Mar. 31, 2019 1,633,511 $ 17 3,178,773 (1,596) (1,543,683)
Beginning balance (in shares) at Dec. 31, 2019   176,505,000      
Beginning balance at Dec. 31, 2019 $ 1,405,391 $ 17 3,271,097 (1,005) (1,864,718)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued under equity compensation plans (in shares) 49,000 1,358,000      
Shares issued under equity compensation plans $ 11,347   11,347    
Stock-based compensation 24,211   24,211    
Comprehensive loss (144,523)     (5,872) (138,651)
Ending balance (in shares) at Mar. 31, 2020   177,863,000      
Ending balance at Mar. 31, 2020 $ 1,296,426 $ 17 $ 3,306,655 $ (6,877) $ (2,003,369)