Marketable Investments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of available for sale securities at their contractual maturity date
FY 2013, Total	$ 56,824
FY 2014, Total	55,053
FY 2015, Total	22,999
Thereafter, Total	8,970
Total short and long term	143,846	146,556
Federal agency and corporate obligations [Member]
Summary of available for sale securities at their contractual maturity date
FY 2013, Total	50,403
FY 2014, Total	44,727
FY 2015, Total	20,874
Thereafter, Total
Total short and long term	116,004	127,509
State and municipal obligations [Member]
Summary of available for sale securities at their contractual maturity date
FY 2013, Total	6,421
FY 2014, Total	10,326
FY 2015, Total	2,125
Thereafter, Total
Total short and long term	18,872	9,482
ARS [Member]
Summary of available for sale securities at their contractual maturity date
FY 2013, Total
FY 2014, Total
FY 2015, Total
Thereafter, Total	8,970
Total short and long term	$ 8,970

- Definition

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 represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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