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Investments (Investments Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 8,942	$ 6,077
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(11)	(6)
Fair Value	8,931	6,071
Current assets
Gain (Loss) on Investments [Line Items]
Amortized Cost	8,942	6,077
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(11)	(6)
Fair Value	8,931	6,071
Non current assets
Gain (Loss) on Investments [Line Items]
Amortized Cost	0	0
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	0	0
Fair Value	$ 0	$ 0

X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

+ References

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-Name Accounting Standards Codification
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