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Equity - Preferred Stock (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |
Excess Tax Benefits from Share-Based Compensation | $ 946,000 | $ 860,000 | $ 0
Dividends, Preferred Stock, Cash | $ 13,182,000 | $ 13,182,000 | 13,182,000
Series A Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Shares Issued | 2,400,000 | 2,400,000 |
Preferred Stock, Dividend Rate, Percentage | 5.875% |  |
Preferred stock, par value | $ 25 | $ 25 |
Preferred Stock, Liquidation Preference Per Share | $ 25 |  |
Payments of Stock Issuance Costs | $ 1,700,000 |  |
Dividends, Preferred Stock, Cash | $ 0.3672 |  |
Series B Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Shares Issued | 3,000,000 | 3,000,000 |
Preferred Stock, Dividend Rate, Percentage | 6.875% |  |
Preferred stock, par value | $ 25 | $ 25 |
Payments of Stock Issuance Costs | $ 1,900,000 |  |
Dividends, Preferred Stock, Cash |  | $ 0.4297 |
Series C Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Shares Issued | 3,000,000 | 3,000,000 |
Preferred stock, par value | $ 25 | $ 25 |
Payments of Stock Issuance Costs | $ 1,600,000 |  |
Dividends, Preferred Stock, Cash |  |  | $ 0.3750
Up to but excluding July 17, 2024 [Member] | Series C Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.00% |  |
July 17, 2024, thereafter [Member] | Series C Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Dividend Variable Rate, Percentage | 3.26% |  |

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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + 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://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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 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=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 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=109259400&loc=d3e21484-112644 + Details
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