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Fair Value Measurements - Narrative (Details) - USD ($)	Dec. 31, 2017	Feb. 10, 2017	Oct. 04, 2016
New Building Note | Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Face amount of debt instrument		$ 35,000,000.0	$ 35,000,000.0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair value of investments	$ 5,072,000
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair value of investments	5,072,000
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair value of investments	$ 0

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Name Accounting Standards Codification
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