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Stockholders' Equity - Schedule of Preferred Stock Issued and Outstanding (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 30,900,000
Preferred stock, carrying value |  | $ 542,232,000 |  | $ 504,765,000
Series B Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) |  | 6,000,000 |  | 6,000,000
Preferred stock, shares issued (in shares) |  | 3,156,087 |  | 3,156,087
Preferred stock, carrying value |  | $ 76,180,000 |  | $ 76,180,000
Preferred stock, liquidation preference |  | $ 78,902,000 |  | $ 78,902,000
Preferred stock, contractual rate, percentage |  | 7.75% |  | 7.75%
Series C Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 6,600,000
Preferred stock, shares issued (in shares) |  |  |  | 4,181,807
Preferred stock, carrying value |  |  |  | $ 101,102,000
Preferred stock, liquidation preference |  |  |  | $ 104,545,000
Preferred stock, contractual rate, percentage |  | 7.875% |  | 7.875%
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 25.00 |  |
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) |  | 8,400,000 |  | 8,400,000
Preferred stock, shares issued (in shares) |  | 6,123,495 |  | 6,123,495
Preferred stock, carrying value |  | $ 148,134,000 |  | $ 148,134,000
Preferred stock, liquidation preference |  | $ 153,087,000 |  | $ 153,087,000
Preferred stock, contractual rate, percentage |  | 8.00% |  | 8.00%
Series D Preferred Stock | LIBOR |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, floating annual rate, percentage |  | 0.00057% | 0.00057% |
Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) | 2,000,000 | 9,900,000 |  | 9,900,000
Preferred stock, shares issued (in shares) |  | 7,411,499 |  | 7,411,499
Preferred stock, carrying value |  | $ 179,349,000 |  | $ 179,349,000
Preferred stock, liquidation preference |  | $ 185,288,000 |  | $ 185,288,000
Preferred stock, contractual rate, percentage |  | 7.875% |  | 7.875%
Series E Preferred Stock | LIBOR |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, floating annual rate, percentage |  | 0.06429% | 0.06429% |
Series F Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) | 5,750,000 | 7,750,000 |  |
Preferred stock, shares issued (in shares) |  | 5,750,000 |  |
Preferred stock, carrying value |  | $ 138,569,000 |  |
Preferred stock, liquidation preference |  | $ 143,750,000 |  |
Preferred stock, contractual rate, percentage | 6.875% | 6.875% |  |
Series F Preferred Stock | Underwritten Public Offering |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 25 |  |
Series F Preferred Stock | LIBOR |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, floating annual rate, percentage |  | 0.0613% |  |
Preferred Stock, Series Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) |  | 32,050,000 |  | 30,900,000
Preferred stock, shares issued (in shares) |  | 22,441,081 |  | 20,872,888
Preferred stock, carrying value |  | $ 542,232,000 |  | $ 504,765,000
Preferred stock, liquidation preference |  | $ 561,027,000 |  | $ 521,822,000

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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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=123467817&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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 5: 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=123467817&loc=d3e21484-112644 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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