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Marketable Securities - Maturities of Held to Maturity Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Marketable Securities [Abstract]
Due within one year	$ 56,088
Due in one to five years	55,342
Total	$ 111,430

Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year through the fifth fiscal year following the latest fiscal year.

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- Definition

Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year following the latest fiscal year.

+ References+ Details