Fair Value Measurements (Details Narrative) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) integer	Mar. 31, 2018 USD ($)
Number of corporate bonds \| integer	48
Unrealized gain on corporate bonds	$ 1,125
Realized gain on corporate bonds	119
Amortized cost of investments	147,653
Carrying amount of other long-term debt	88,823	$ 117,231
Fair value of other long-term debt	90,173	$ 118,469
Fair Value, Measurements, Recurring [Member]
Assets measured at fair value	$ 148,778

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-SubTopic 10
-Section 50
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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

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

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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