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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% |  |  |  |  |

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