- Definition

Other (not elsewhere specified in the taxonomy) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

Fair Value of Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial assets and liabilities measured at fair value on recurring basis
Cash equivalents - money market fund	$ 230,069	$ 59,860
Quoted Prices in Active Markets (Level 1) [Member]
Financial assets and liabilities measured at fair value on recurring basis
Cash equivalents - money market fund	230,069	59,860
Significant Other Observable Inputs (Level 2) [Member]
Financial assets and liabilities measured at fair value on recurring basis
Cash equivalents - money market fund
Significant Unobservable Inputs (Level 3) [Member]
Financial assets and liabilities measured at fair value on recurring basis
Cash equivalents - money market fund