Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 2) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment income (loss)
Interest and dividend income	$ 6,267,000	$ 5,120,000	$ 7,536,000
Gains (losses) on investments, net	5,564,000us-gaap_GainLossOnInvestments	91,457,000us-gaap_GainLossOnInvestments	55,601,000us-gaap_GainLossOnInvestments
Investment income (loss)	11,831,000	96,577,000	63,137,000
Net unrealized gains (loss) from trading securities	2,500,000	41,100,000
Realized gains on short-term and long term investments	$ 89,000,000	$ 14,500,000

Represents the realized gain on the sale of short term and long term investments.

No definition available.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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-Name Accounting Standards Codification

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-Topic 942

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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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- Definition

Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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