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Marketable Securities Marketable Securities, Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 6,998
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	6,994
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	18,733
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	18,796
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	365
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	366
Available-for-sale Securities, Amortized Cost Basis	26,096	$ 25,490
Available-for-sale Securities	$ 26,156

X

- Definition

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

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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