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Equity Incentive Plan - Restricted Share Awards Granted and Vested (Details) - shares					12 Months Ended	31 Months Ended	35 Months Ended	47 Months Ended
	Jan. 11, 2017	Jun. 01, 2015	Jan. 30, 2015	Jan. 31, 2014	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2017
Time-based Restricted Stock Awards | Awarded January 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Shares Granted				48,213
Vested (in shares)								48,213
Time-based Restricted Stock Awards | Awarded January 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Shares Granted			40,161
Vested (in shares)							26,774
Time-based Restricted Stock Awards | Awarded June 1, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Shares Granted		8,949
Vested (in shares)						5,966
Performance-based Restricted Stock Awards | Awarded January 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Shares Granted				38,805
Vested (in shares)								12,935
Performance-based Restricted Stock Awards | Awarded January 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Shares Granted			36,144
Vested (in shares)							0
Restricted Board Awards | Awarded November 11, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Shares Granted	5,000
Vested (in shares)					0

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://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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