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Significant Accounting Policies - Investment in Marketable Securities (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Investment in Marketable Securities
Marketable securities			$ 28,570,000	$ 28,579,000
Proceeds from sale of marketable securities	$ 54,400,000
Marketable Securities, Realized Gain (Loss)		$ 3,300,000
Fair Value
Investment in Marketable Securities
Marketable securities			28,570,000	28,579,000
Equity marketable securities
Investment in Marketable Securities
Cost basis			0	0
Commercial mortgage-backed securities
Investment in Marketable Securities
Marketable securities			28,570,000	28,579,000
Cost basis			$ 27,500,000	$ 27,500,000

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

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