FAIR VALUE MEASUREMENTS (Details) (USD $)																													1 Months Ended	9 Months Ended
	Mar. 31, 2012	Sep. 30, 2012 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Commercial paper [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Commercial paper [Member]	Sep. 30, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Money market funds [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Money market funds [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Certificates of Deposit [Member]	Sep. 30, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Corporate securities [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Corporate securities [Member]	Sep. 30, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Sep. 30, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Commercial paper [Member]	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Commercial paper [Member]	Sep. 30, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds [Member]	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds [Member]	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Certificates of Deposit [Member]	Sep. 30, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate securities [Member]	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate securities [Member]	Sep. 30, 2012 Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member]	Sep. 30, 2012 Significant Other Observable Inputs (Level 2) [Member] Commercial paper [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member] Commercial paper [Member]	Sep. 30, 2012 Significant Other Observable Inputs (Level 2) [Member] Money market funds [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member] Money market funds [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member] Certificates of Deposit [Member]	Sep. 30, 2012 Significant Other Observable Inputs (Level 2) [Member] Corporate securities [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member] Corporate securities [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Mar. 31, 2012 SemiSouth [Member]	Sep. 30, 2012 Contingent Purchase Commitment [Member] SemiSouth [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure					$ 9,849,000	$ 147,000	$ 30,190,000							$ 0	$ 147,000	$ 30,190,000							$ 9,849,000	$ 0	$ 0
Investments, Fair Value Disclosure				12,922,000				10,000,000	35,605,000	62,940,000			0				0	0	0			12,922,000				10,000,000	35,605,000	62,940,000
Assets, Fair Value Disclosure		48,674,000	112,979,000								147,000	30,190,000								48,527,000	82,789,000
Purchase option																															6,200,000
Initial Loan to SemiSouth	18,000,000																														18,000,000
SemiSouth Loan	18,000,000
Fair Value of Purchase Option on SemiSouth Note																															6,200,000	0
SemiSouth Interest Discount Amortization																															1,600,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance																														0
Purchases and issuances																													13,433,000	13,433,000
Change in fair value																														(13,433,000)
Ending balance																														$ 0