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SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	3 Months Ended
SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	Mar. 31, 2012 D	Dec. 31, 2011
Fair Value of Financial Instruments
Carrying value of Senior Notes	$ 506,095,000	$ 508,033,000
Revenue Recognition
Minimum period of receivable balances for which company-wide evaluation of its collectability is performed at least semi-annually (in days)	180
7.125% Senior Notes due 2018
Fair Value of Financial Instruments
Fair value of Senior Notes	210,500,000
Carrying value of Senior Notes	$ 200,000,000	$ 200,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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