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Investments (Investments Held to Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Gain (Loss) on Securities [Line Items]
Amortized Cost	$ 2,955	$ 6,077
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(3)	(6)
Fair Value	2,952	6,071
Current assets
Gain (Loss) on Securities [Line Items]
Amortized Cost	2,955	6,077
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(3)	(6)
Fair Value	2,952	6,071
Non current assets
Gain (Loss) on Securities [Line Items]
Amortized Cost	0	0
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	0	0
Fair Value	$ 0	$ 0

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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