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Dividends and Earnings Per Share - Dilutive Effect (Details) - shares	12 Months Ended			68 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Earnings per share
Accrued Dividend Equivalent Units	5,121			5,121
Restricted Stock Units
Earnings per share
Granted, Units	403,985
Equity Plan | Restricted Stock Units
Earnings per share
Granted, Units	144,920	10,000	100,553	403,985
Accrued Dividend Equivalent Units	5,121			5,121

X

- Definition

Represents the number of units accrued under dividend equivalents.

+ References

No definition available.

+ Details

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- References

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+ Details

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X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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