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Investment in Marketable Securities - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment in Marketable Securities (Textual) [Abstract]
Investment in marketable securities	$ 0	$ 4,758
Impairment on securities included as a component of realized gain (loss)		4,482
Net accumulated other comprehensive income		275	$ 58,572
Gross unrealized losses		72	598
Gross unrealized losses on investments held for less than twelve months, fair value		3,276
Impairment charges on available for sale securities		0	1,327
Dividend income recognized	$ 181	$ 2,857	$ 10,490

X

- Definition

Investment in marketable securities.

+ References

No definition available.

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- Definition

Amount, before tax, of unrealized loss 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

Amortized cost of 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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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), in unrealized loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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Amount of dividend income on nonoperating securities.

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-Topic 220
-SubTopic 10
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Amount of investment in marketable security.

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

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