Stock-Based Compensation (Details 2) - 2013 Plan - Nonvested shares - Certain members of senior management	1 Months Ended
Feb. 28, 2017
Performance -Based
Stock-based compensation
Performance period	3 years
First Vesting Period \| Time-Based
Stock-based compensation
Vesting (as a percent)	33.33%
Second Vesting Period \| Time-Based
Stock-based compensation
Vesting (as a percent)	33.33%
Third Vesting Period \| Time-Based
Stock-based compensation
Vesting (as a percent)	33.33%

Percentage of vesting of share-based compensation awards.

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

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration