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Stockholders' Equity (Series C) (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 02, 2020 USD ($) | Feb. 28, 2020 $ / shares shares | Mar. 31, 2020 director quarter | Dec. 31, 2020 USD ($) quarter $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of series C preferred stock | $ |  |  |  | $ 275,000 | $ 0 | $ 0
Maximum quarters without dividends to get voting rights, in quarters | quarter |  |  |  | 6 |  |
Minimum percentage of preferred shareholders required for approval |  |  |  | 66.67% |  |
Series C Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  | 6.50% |  |
Preferred stock, shares issued (in shares) | shares |  |  |  | 11,000,000 |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.01 |  |
Preferred stock, per share amounts of preferred dividends in arrears |  |  |  | $ 0.53264 |  |
Series C Preferred Stock | Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, dividend rate |  | 6.50% |  | 6.50% | 6.50% |
Shares reclassified to redeemable capital stock (in shares) | shares |  | 12,650,000 |  |  |  |
Preferred stock, shares issued (in shares) | shares |  | 11,000,000.0 |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  | $ 25.00 |  | $ 25.00 | $ 25.00 |
Proceeds from issuance of series C preferred stock | $ | $ 266,000 |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 5.345% |  |  |  |
Preferred stock, redemption price (in dollars per share) |  | $ 25.00 |  |  |  |
Maximum quarters without dividends to get voting rights, in quarters | quarter |  |  | 6 |  |  |
Number of additional directors that can be elected by preferred stock holders | director |  |  | 2 |  |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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