Investments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investment in Marketable Securities (Textual) [Abstract]
Unrealized gain (loss) on available for sale securities	$ (4,154)	$ (2,290)	$ (8,489)
Impairment of equity securities	(2,346)	(6,593)	$ (18,308)
Equity Securities [Member]
Available-for-sale Securities
Cost	3,386	5,687
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	1,179	8
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	559	303
Available-for-sale Securities, Estimated Fair Value	2,766	$ 5,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve Months, Fair Value	614
Twelve months or more, Fair Value	0
Fair Value	614
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,179

Investments in marketable securities.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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