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Deferred Costs (Textual) (Details) $ in Thousands | 1 Months Ended | 8 Months Ended | 12 Months Ended | 20 Months Ended
--- | --- | --- | --- | ---
May 31, 2015 ft² | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 USD ($)
Deferred Costs (Textual) [Abstract] |  |  |  |  |  |
Capitalized internal direct leasing costs |  |  | $ 5,000 | $ 6,600 | $ 7,100 |
2015 Lease [Member] |  |  |  |  |  |
Deferred Costs (Textual) [Abstract] |  |  |  |  |  |
Square feet of office space leased | ft² | 228,000 |  |  |  |  |
Brokerage commission |  |  | 4,200 |  |  |
2015 Lease [Member] | Chairman and Lead Independent Director [Member] |  |  |  |  |  |
Deferred Costs (Textual) [Abstract] |  |  |  |  |  |
Membership interest | 33.30% |  |  |  |  |
Brokerage commission |  | $ 500 | $ 500 |  |  | $ 1,000
2015 Lease [Member] | WDL Real Estate Advisory Group, LLC [Member] |  |  |  |  |  |
Deferred Costs (Textual) [Abstract] |  |  |  |  |  |
Membership interest | 49.00% |  |  |  |  |

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- Definition Costs of sales and operating expenses for the period incurred from transactions with related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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