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FAIR VALUE MEASUREMENTS - Summary of valuation of financial instruments measured at fair value on a recurring basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Available-for-sale securities
Available-for-sale securities	$ 36,247	$ 36,923
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets:
Trading securities
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Municipal obligations
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Corporate obligations
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets:
Trading securities	6,122	6,026
Available-for-sale securities
Available-for-sale securities	36,247	36,923
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Municipal obligations
Available-for-sale securities
Available-for-sale securities	35,483	35,606
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Corporate obligations
Available-for-sale securities
Available-for-sale securities	764	1,317
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets:
Trading securities
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Municipal obligations
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate obligations
Available-for-sale securities
Available-for-sale securities

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Name Accounting Standards Codification

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-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

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

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-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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