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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Fair value disclosure
Cash and cash equivalents	$ 129,150,000	$ 105,354,000	$ 88,553,000	$ 90,702,000
Short-term investments	36,015,000	35,906,000
Restricted cash, cash equivalents, and short-term investments	1,385,000	1,902,000
Concentrations of Credit Risk of Financial Instruments
Cash, cash equivalents, and certificates of deposit which are not FDIC-insured	74,000,000	49,400,000
Fair value disclosure
Fair value disclosure
Cash and cash equivalents	129,150,000	105,354,000
Fair value disclosure | Cash deposits
Fair value disclosure
Cash and cash equivalents	62,863,000	63,547,000
Restricted cash, cash equivalents, and short-term investments	1,385,000	1,902,000
Fair value disclosure | Variable rate demand notes
Fair value disclosure
Cash and cash equivalents	29,786,000	29,706,000
Fair value disclosure | Money market funds
Fair value disclosure
Cash and cash equivalents	36,501,000	12,101,000
Fair value disclosure | Certificates of deposit
Fair value disclosure
Short-term investments	$ 36,015,000	$ 35,906,000

X

- Definition

The amount of cash, cash equivalents and certificates of deposit as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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

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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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