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Convertible Notes (Narrative) (Details)
$ / shares in Units, shares in Millions
 12 Months Ended
Nov. 17, 2017
USD ($)
D
$ / shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Nov. 14, 2017
$ / shares
shares
Debt instrument            
Derivative, nonmonetary notional amount, shares | shares           9.1
Class of warrant or right, number of securities called by warrants or rights | shares           9.1
Class of warrant or right, exercise price of warrants or rights | $ / shares           $ 23.30
Share price | $ / shares           $ 14.56
Potential incremental common shares attributable to dilutive effect of conversion of debt securities | shares   9.1        
Additional paid in capital   $ 1,298,966,000   $ 1,270,426,000    
Payments for hedge, financing activities     $ 33,500,000      
Proceeds from issuance of warrants     $ 23,200,000      
1.375% convertible notes due 2023 | Convertible senior notes            
Debt instrument            
Stock price premium           60.00%
Face value $ 172,500,000 $ 172,500,000   $ 172,500,000    
Liability component, principal amount 137,300,000          
Equity component, principal amount $ 35,200,000          
Debt discount amortization period 5 years          
Stated Interest rate (as a percent) 1.375% 1.375%   1.375% 1.375%  
Debt issuance cost, convertible, liability component $ 2,600,000          
Debt issuance cost, convertible, equity component 700,000          
Debt issuance costs, gross $ 3,300,000          
Conversion rate, number of shares to be issued per $1000 of principal (in shares) 52.8318          
Principal amount of notes used as the denominator to determine number of shares converted into notes $ 1,000          
Initial conversion price of notes (in dollars per share) | $ / shares $ 18.93          
Debt instrument, convertible, threshold trading days 20          
Debt Instrument, Convertible, Threshold Consecutive Trading Days | D 30          
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%          
Number of consecutive trading days before the five business days during the debt instrument measurement period 5 days          
Denomination of the principal amount of notes used to calculate the percent of trading price during the debt instrument measurement period $ 1,000          
Maximum conversion price as a percentage of closing stock price 98.00%          
Percentage of face amount of debt instrument redeemable at the company's option 100.00%          
Events of default            
Period of default in payment of interest (in days) 30 days          
Period of default to comply with other agreements (in days) 60 days          
Minimum percentage of aggregate outstanding principal required for default event with other agreements 25.00%          
Minimum principal amount of debt nonpayment required for debt default to occur $ 40,000,000          
Period of nonpayment of principal amount required for debt default to occur (in days) 30 days          
Minimum percentage of aggregate outstanding principal required for nonpayment of debt default to occur 25.00%          
Minimum percentage of aggregate outstanding principal required for immediate payment declaration to occur 25.00%          
Debt Instrument, Default Percent Of Principal And Accrued And Unpaid Interest 100.00%