Fair Value Measurements (Details Narrative) $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($) integer	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)
Number of corporate bonds \| integer	41
Unrealized gain on corporate bonds	$ 1,606
Realized gain on corporate bonds	447
Amortized cost of investments	120,577
Carrying amount of corporate bonds	122,183	$ 165,212
Carrying amount of other long-term debt	88,857		$ 88,720
Fair value of other long-term debt	92,541		$ 87,436
Fair Value, Measurements, Recurring [Member]
Assets measured at fair value	$ 122,183

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

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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).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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

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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.

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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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