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.

+ References+ Details

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an 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

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

+ Details

FAIR VALUE OF ASSETS AND LIABILITIES (Details) (USD $)		12 Months Ended
FAIR VALUE OF ASSETS AND LIABILITIES (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2012 Auction-rate securities	Dec. 31, 2012 Recurring basis	Dec. 31, 2011 Recurring basis	Dec. 31, 2011 Recurring basis Corporate debt securities and other obligations	Dec. 31, 2012 Recurring basis Corporate equity securities	Dec. 31, 2012 Recurring basis Auction-rate securities	Dec. 31, 2011 Recurring basis Auction-rate securities	Dec. 31, 2012 Recurring basis Institutional money market funds	Dec. 31, 2011 Recurring basis Institutional money market funds	Dec. 31, 2012 Recurring basis Fixed income	Dec. 31, 2011 Recurring basis Fixed income	Dec. 31, 2012 Recurring basis Marketable equity securities	Dec. 31, 2011 Recurring basis Marketable equity securities	Dec. 31, 2011 Recurring basis Total institutional funds - Deferred compensation plan	Dec. 31, 2012 Recurring basis Total Institutional Funds [Member]	Dec. 31, 2012 Recurring basis Level 1	Dec. 31, 2011 Recurring basis Level 1	Dec. 31, 2012 Recurring basis Level 1 Corporate equity securities	Dec. 31, 2012 Recurring basis Level 1 Institutional money market funds	Dec. 31, 2011 Recurring basis Level 1 Institutional money market funds	Dec. 31, 2012 Recurring basis Level 1 Fixed income	Dec. 31, 2011 Recurring basis Level 1 Fixed income	Dec. 31, 2012 Recurring basis Level 1 Marketable equity securities	Dec. 31, 2011 Recurring basis Level 1 Marketable equity securities	Dec. 31, 2011 Recurring basis Level 1 Total institutional funds - Deferred compensation plan	Dec. 31, 2012 Recurring basis Level 1 Total Institutional Funds [Member]	Dec. 31, 2012 Recurring basis Level 2	Dec. 31, 2011 Recurring basis Level 2	Dec. 31, 2011 Recurring basis Level 2 Corporate debt securities and other obligations	Dec. 31, 2012 Recurring basis Level 3	Dec. 31, 2011 Recurring basis Level 3	Dec. 31, 2012 Recurring basis Level 3 Auction-rate securities	Dec. 31, 2011 Recurring basis Level 3 Auction-rate securities
Investments measured at fair value on a recurring basis
Money market funds			$ 1,036,000	$ 18,164,000													$ 1,036,000	$ 18,164,000
Short-term investments					3,079,000	2,687,000													2,687,000											3,079,000
Other assets			6,044,000	7,150,000			1,066,000	2,251,000	597,000	549,000	902,000	1,613,000	3,479,000	2,737,000	4,899,000	4,978,000	4,978,000	4,899,000		597,000	549,000	902,000	1,613,000	3,479,000	2,737,000	4,899,000	4,978,000				1,066,000	2,251,000	1,066,000	2,251,000
Total			9,767,000	28,393,000													8,701,000	23,063,000										0	3,079,000		1,066,000	2,251,000
Proceeds from Sale of Available-for-sale Securities		$ 1,200,000
Maximum percentage of assets measured using Level 3 valuation methodologies to total assets	1.00%