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Net Income (Loss) Per Share (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 16, 2021 | Aug. 05, 2020 | Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items] |  |  |
Fees, commissions and other costs |  |  | $ 849,000
Convertible Senior Notes Due 2026 | Senior Notes |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Issued amount | $ 460,000,000 |  |
Interest rate (as a percentage) | 0.00% |  |
Conversion price (in dollars per share) | $ 35.92 |  |
At-the-Market Equity Offering |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Aggregate gross sales price, up to |  | $ 150,000,000 |
Number of shares sold (in shares) |  |  | 4,616
Net proceeds from sale of stock |  |  | $ 24,664,000
Availability remaining under ATM Program |  |  | $ 124,487,000

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