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Fair Value Measurements Schedule Of Fair Value Of Assets (Details) (USD $)
In Thousands, unless otherwise specified

Mar. 31, 2013

Dec. 31, 2012

Mutual funds and money market funds, fair value

$ 378

$ 3,486

Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]

Assets measured at fair value

64,312

36,242

Estimate of Fair Value, Fair Value Disclosure [Member] | Money Market Funds [Member] | Cash and cash equivalents [Member] | Fair Value, Measurements, Recurring [Member]

Money market funds, included in cash and cash equivalents, fair value

50,001

20,001

Estimate of Fair Value, Fair Value Disclosure [Member] | Money Market Funds [Member] | Investments, employee benefit plans, at fair value [Member] | Fair Value, Measurements, Recurring [Member]

Mutual funds and money market funds, fair value

1,051

^[1]

4,357

^[1]

Estimate of Fair Value, Fair Value Disclosure [Member] | Mutual Funds [Member] | Investments, employee benefit plans, at fair value [Member] | Fair Value, Measurements, Recurring [Member]

Mutual funds and money market funds, fair value

13,260

^[1]

11,884

^[1]

Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]

Assets measured at fair value

13,260

11,884

Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Cash and cash equivalents [Member] | Fair Value, Measurements, Recurring [Member]

Money market funds, included in cash and cash equivalents, fair value

0

0

Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Investments, employee benefit plans, at fair value [Member] | Fair Value, Measurements, Recurring [Member]

Mutual funds and money market funds, fair value

0

^[1]

0

^[1]

Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] | Investments, employee benefit plans, at fair value [Member] | Fair Value, Measurements, Recurring [Member]

Mutual funds and money market funds, fair value

13,260

^[1]

11,884

^[1]

Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]

Assets measured at fair value

51,052

24,358

Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] | Cash and cash equivalents [Member] | Fair Value, Measurements, Recurring [Member]

Money market funds, included in cash and cash equivalents, fair value

50,001

20,001

Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] | Investments, employee benefit plans, at fair value [Member] | Fair Value, Measurements, Recurring [Member]

Mutual funds and money market funds, fair value

1,051

^[1]

4,357

^[1]

Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member] | Investments, employee benefit plans, at fair value [Member] | Fair Value, Measurements, Recurring [Member]

Mutual funds and money market funds, fair value

0

^[1]

0

^[1]

Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]

Assets measured at fair value

0

0

Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | Cash and cash equivalents [Member] | Fair Value, Measurements, Recurring [Member]

Money market funds, included in cash and cash equivalents, fair value

0

0

Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] | Investments, employee benefit plans, at fair value [Member] | Fair Value, Measurements, Recurring [Member]

Mutual funds and money market funds, fair value

0

^[1]

0

^[1]

Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member] | Investments, employee benefit plans, at fair value [Member] | Fair Value, Measurements, Recurring [Member]

Mutual funds and money market funds, fair value

$ 0

^[1]

$ 0

^[1]

[1]	Included in Investments, employee benefit plans fair value on the consolidated balance sheets.

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal 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.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References+ Details