FAIR VALUE MEASUREMENTS (Details) (USD $)	12 Months Ended																								12 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Commercial paper [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Money market funds [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Money market funds [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Corporate securities [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Corporate securities [Member]	Dec. 31, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	Dec. 31, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Commercial paper [Member]	Dec. 31, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds [Member]	Dec. 31, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate securities [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate securities [Member]	Dec. 31, 2013 Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member]	Dec. 31, 2013 Significant Other Observable Inputs (Level 2) [Member] Commercial paper [Member]	Dec. 31, 2013 Significant Other Observable Inputs (Level 2) [Member] Money market funds [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Money market funds [Member]	Dec. 31, 2013 Significant Other Observable Inputs (Level 2) [Member] Corporate securities [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Corporate securities [Member]	Dec. 31, 2013 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2012 Semi South [Member]	Mar. 31, 2012 Semi South [Member]	Dec. 31, 2012 Semi South [Member] Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchase Options Other																												$ 6,200,000
Cash and Cash Equivalents, Fair Value Disclosure						3,099,000							0							3,099,000
Investments, Fair Value Disclosure							17,492,000	7,140,000	109,179,000	31,766,000				17,492,000	7,140,000	0	0				0	0	109,179,000	31,766,000
Assets, Fair Value Disclosure				129,770,000	38,906,000						17,492,000	7,140,000						112,278,000	31,766,000
Asset Impairment Charges	0	33,745,000	0																								33,700,000
Initial Loan to SemiSouth																												18,000,000
Fair value of note receivable																													13,400,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance																									0	0
Purchases and issuances																									0	13,433,000
Settlements																									0	(13,433,000)
Ending balance																									0	0
Investment Income, Amortization of Discount																													$ 1,600,000