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Cash and Cash Equivalents, Restricted Cash and Marketable Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Marketable securities:
Total Marketable securities	$ 164,159	$ 76,647
Fair Value, Inputs, Level 2 [Member]
Marketable securities:
Fixed-income debt securities	114,383	57,032
Commercial paper	$ 49,776	$ 19,615

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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