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Summary of Significant Accounting Policies Tax (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Summary Of Significant Accounting Policies Tax Parenthetical Details [Abstract] |  |  |
Income tax refund claims or receives | $ 1.6 |  |
Term to refund carryover amount | 4 years |  |
Refund percentage available in first year | 50.00% |  |
Remaining Tax Carryover Amount | $ 1.6 |  |
Expected alternative minimum tax benefit | $ 3.2 |  |
Dividend payable common share/unit, per share | $ 0.5675 | $ 0.54 | $ 0.50375

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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