FAIR VALUE MEASUREMENTS (Details) (USD $)																															6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2012 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Commercial paper [Member]	Jun. 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]	Jun. 30, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Certificates of Deposit [Member]	Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Certificates of Deposit [Member]	Jun. 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]	Jun. 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]	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Commercial paper [Member]	Jun. 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]	Jun. 30, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Certificates of Deposit [Member]	Dec. 31, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Certificates of Deposit [Member]	Jun. 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]	Jun. 30, 2012 Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member] Commercial paper [Member]	Jun. 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]	Jun. 30, 2012 Significant Other Observable Inputs (Level 2) [Member] Certificates of Deposit [Member]	Dec. 31, 2011 Significant Other Observable Inputs (Level 2) [Member] Certificates of Deposit [Member]	Jun. 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]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Jun. 30, 2012 SemiSouth [Member]	Mar. 31, 2012 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	$ 8,908,000	$ 30,190,000							$ 0	$ 8,908,000	$ 30,190,000							$ 9,849,000	$ 0	$ 0
Investments, Fair Value Disclosure									10,000,000	10,000,000	50,068,000	62,940,000						0	0	0	0						10,000,000	10,000,000	50,068,000	62,940,000
Assets, Fair Value Disclosure				68,976,000	112,979,000								8,908,000	30,190,000								60,068,000	82,789,000
Purchase option	6,216,000		0																													6,200,000	6,200,000
Initial Loan to SemiSouth		18,000,000																															18,000,000
Fair Value of SemiSouth Note																															12,678,000
SemiSouth Loan	18,000,000
Fair Value of Purchase Option on SemiSouth Note																																6,200,000
SemiSouth Interest Discount Amortization																																900,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance																															0
Change in fair value																															0
Settlements																															0
Ending balance																															$ 12,678,000