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Debt Obligations, Convertible Senior Unsecured Notes (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2016 | Jan. 31, 2020 $ / shares | Dec. 31, 2018 | Jul. 20, 2018 | Jul. 03, 2018
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Cash paid for the exchange of convertible notes |  |  |  | $ 22,145,000 | $ 3,037,000 |  |  |  |  |  |
Loss on extinguishment of debt |  | $ (1,592,000) |  | (3,546,000) | (128,000) |  |  |  |  |  |
Total |  | 4,877,079,000 |  | 4,877,079,000 |  |  |  |  |  |  |
Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 278,490,000 |  | $ 278,490,000 |  | $ 300,914,000 |  |  |  |  |
Proceeds received, net of estimated issuance costs |  |  |  |  |  | 34,000,000.0 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | 7,300,000 |  |  |  |  |
Inducement charge |  |  |  |  |  | $ 1,100,000 |  |  |  |  |
Percentage of the Notes required to be repurchased if the agreement is fundamentally changed |  |  |  |  |  |  | 100.00% |  |  |  |
Maturity period (in years) |  |  |  | 2 years 3 months 7 days |  | 2 years 8 months 1 day |  |  |  |  |
Unamortized Debt Discount |  | 7,242,000 |  | $ 7,242,000 |  | $ 9,235,000 |  |  |  |  |
Unamortized Deferred Financing Fees |  | 6,004,000 |  | 6,004,000 |  | 7,527,000 |  |  |  |  |
Total |  | 265,244,000 |  | 265,244,000 |  | 284,152,000 |  |  |  |  |
Net Carrying Value, Equity Component |  |  |  | 9,962,000 |  | $ 9,962,000 |  |  |  |  |
Interest expense |  | 4,800,000 | $ 4,900,000 | 10,000,000.0 | 10,200,000 |  |  |  |  |  |
Interest expense related to cash coupon |  | 3,300,000 | 3,400,000 | 6,700,000 | 6,900,000 |  |  |  |  |  |
Debt discount |  | 800,000 | 800,000 | 1,700,000 | 1,700,000 |  |  |  |  |  |
Deferred fees expensed as interest expense |  | $ 700,000 | $ 700,000 | $ 1,600,000 | $ 1,500,000 |  |  |  |  |  |
Cost of the notes (as a percent) |  | 6.75% |  | 6.75% |  | 6.80% |  |  |  |  |
5.375% Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.375% |  | 5.375% |  |  |  |  | 5.375% |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes | 90.093 |  |  |  |  |  |  |  |  |  |
6.50% Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Proceeds from issued debt |  |  |  | $ 200,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 6.50% |  |
5.25% Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.25% |  | 5.25% |  | 5.25% |  |  | 5.25% | 5.25% | 5.25%
Cash paid for the exchange of convertible notes |  |  |  | $ 233,100,000 |  | $ 228,700,000 |  |  |  |  |
Common stock exchanged (in shares) | shares |  |  |  | 4,478,315 |  |  |  |  |  |  |
4.75% Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 1,000 |  | $ 1,000 |  | $ 264,000,000.0 |  |  |  |  |
Interest rate (as a percent) |  | 4.75% |  | 4.75% |  | 4.75% |  |  |  |  |
Proceeds received, net of estimated issuance costs |  |  |  |  |  | $ 256,500,000 |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  | 56.1695 |  |  |  |  |  |  |
Conversion price per share of common stock | $ / shares |  | $ 17.80 |  | $ 17.80 |  |  |  |  |  |  |
4.75% Convertible Notes | First Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,000 |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  |  |  | 56.1695 |  |  |  |  |
Conversion price per share of common stock | $ / shares |  |  |  |  |  | $ 17.80 |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 154,336,000 |  | $ 154,336,000 |  | $ 154,336,000 |  |  |  |  |
Deferred fees expensed as interest expense |  |  |  | 1,900,000 |  | $ 2,000,000.0 |  |  |  |  |
Issued on July 3, 2018 | 5.375% Convertible Notes | First Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 1,000 |  | $ 1,000 |  |  |  |  |  |  |
Conversion price per share of common stock | $ / shares |  | $ 11.50 |  | $ 11.50 |  |  |  |  |  |  |
Issued on July 3, 2018 | 6.50% Convertible Notes | First Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Conversion price per share of common stock | $ / shares |  | $ 9.28 |  | $ 9.28 |  |  |  |  |  |  |
Issued on July 3, 2018 | 5.25% Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 500,000 |  | $ 500,000 |  |  |  |  |  |  |
Issued on July 3, 2018 | 5.25% Convertible Notes | First Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Conversion price per share of common stock | $ / shares |  | $ 12.85 |  | $ 12.85 |  |  |  |  |  |  |
Issued on July 20, 2018 | 5.375% Convertible Notes | First Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  | 86.9943 |  |  |  |  |  |  |
Issued on July 20, 2018 | 5.375% Convertible Notes | Second Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  | 80.6055 |  |  |  |  |  |  |
Conversion price per share of common stock | $ / shares |  | 11.10 |  | $ 11.10 |  |  |  |  |  |  |
Issued on July 20, 2018 | 6.50% Convertible Notes | First Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  | 107.7122 |  |  |  |  |  |  |
Issued on July 20, 2018 | 6.50% Convertible Notes | Second Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  | 116.9744 |  |  |  |  |  |  |
Conversion price per share of common stock | $ / shares |  | $ 8.55 |  | $ 8.55 |  |  |  |  |  |  |
Issued on July 20, 2018 | 5.25% Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 13,800,000 |  | $ 13,800,000 |  |  |  |  |  |  |
Issued on July 20, 2018 | 5.25% Convertible Notes | First Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  | 77.8331 |  |  |  |  |  |  |
Issued on July 20, 2018 | 5.25% Convertible Notes | Second Offering |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 1,000 |  | $ 1,000 |  |  |  |  |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  | 90.093 |  |  |  |  |  |  |
Conversion price per share of common stock | $ / shares |  |  |  |  |  |  |  | $ 12.41 |  |  |

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