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Convertible Subordinated Notes (Narrative) (Details) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 04, 2019 USD ($) | Dec. 24, 2018 USD ($) | May 07, 2018 USD ($) shares | Oct. 25, 2017 $ / shares | Oct. 24, 2017 $ / shares | Mar. 19, 2014 component $ / shares | Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 $ / shares | Jun. 30, 2019 $ / shares | Mar. 31, 2019 $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares |  |  |  | $ 0.075 | $ 0.05 |  | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.300 | $ 0.300 | $ 0.225
Debt instrument, term |  |  |  |  |  |  |  |  |  |  | 77 months |  |
Deferred tax liability |  |  |  |  |  |  | $ 289,000 |  |  |  | $ 289,000 | $ 244,000 |
Amortization of debt issuance costs |  |  |  |  |  |  |  |  |  |  | 392,000 | 532,000 | $ 820,000
Deferred Tax Liabilities, Convertible Subordinated Notes |  |  |  |  |  |  | $ 75,000 |  |  |  | 75,000 | 131,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 25,522,000 | 21,109,000 | 12,948,000
Payments for Repurchase of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  | $ 27,000 | $ 98,266,000 | 0
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 | $ 0.01 |
Principal amount |  |  |  |  |  |  | $ 90,764,000 |  |  |  | $ 90,764,000 |  |
Net loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 0 | $ 502,000 | 0
Payment of Debt Conversion, Transaction Costs |  |  |  |  |  |  |  |  |  |  | $ 0 | 885,000 | 0
Convertible subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate, Unamortized Debt Discount and Debt Issuance Costs, Effective Percentage |  |  |  |  |  |  | 3.20% |  |  |  | 3.20% |  |
Principal amount |  |  |  |  |  |  | $ 143,750,000.00 |  |  |  | $ 143,750,000.00 |  |
Debt instrument interest rate (in percent) |  |  |  |  |  | 2.75% |  |  |  |  |  |  |
Debt conversion (in dollars per share) | $ / shares |  |  |  |  |  | $ 22.56 | $ 22.00 |  |  |  | $ 22.00 |  |
Debt instrument, term |  |  |  |  |  |  |  |  |  |  | 7 years |  |
Number of recognition components, convertible debt | component |  |  |  |  |  | 2 |  |  |  |  |  |  |
Deferred tax liability |  |  |  |  |  |  | $ 12,700,000 |  |  |  | $ 12,700,000 |  |
Conversion ratio |  |  |  |  |  | 44.3169 |  |  |  |  | 45.4615 |  |
Long-term debt, fair value |  |  |  |  |  |  | $ 7,800,000 |  |  |  | $ 7,800,000 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 200,000 | 1,900,000 | 4,000,000
Amortization of debt issuance costs |  |  |  |  |  |  |  |  |  |  | 24,000 | 245,000 | 517,000
Accretion of discount |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 2,200,000 | $ 4,300,000
Interest Rate, Unamortized Debt Discount, Effective Percentage |  |  |  |  |  |  | 11.40% |  |  |  | 11.40% | 11.30% |
Convertible Subordinated Debt | $ 25,000 | $ 22,418,000.16 | $ 115,000,000 |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Convertible Preferred Stock, Principle | $ 27,163 | 22,900,000 | 74,800,000 |  |  |  |  |  |  |  |  |  |
Interest expense |  | 200,000 | 400,000 |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Convertible Preferred Stock |  | 23,000,000 | $ 75,200,000 |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | shares |  |  | 2,822,859 |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 6,319,000 |  |  |  | $ 6,319,000 | $ 6,346,000 |
Gain (Loss) On Repurchase Of Convertible Junior Subordinated Debentures |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |
Net loss on early extinguishment of debt |  | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |
Payment of Debt Conversion, Transaction Costs |  |  |  |  |  |  |  |  |  |  | 900,000 |  |
Component of Convertible Debt, Transaction Expense, Early Extinguishment |  |  |  |  |  |  |  |  |  |  | 600,000 |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |

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