FAIR VALUE MEASUREMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair value disclosures
Current maturities		$ (75,000)
Long-Term Debt, excluding current maturities	1,162,000	1,012,000
Carrying Amount
Fair value disclosures
Long-Term Debt	1,162,000	1,087,000
Current maturities		(75,000)
Long-Term Debt, excluding current maturities	1,162,000	1,012,000
Estimated Fair Value
Fair value disclosures
Long-Term Debt	1,258,627	1,213,474
Current maturities		(77,175)
Long-Term Debt, excluding current maturities	$ 1,258,627	$ 1,136,299