CONVERTIBLE NOTES PAYABLE	6 Months Ended
CONVERTIBLE NOTES PAYABLE	Jun. 30, 2013
Debt Disclosure [Abstract]
Convertible Notes Payable	CONVERTIBLE NOTES PAYABLE In December 2006 and January 2007, the Company issued convertible notes totaling $115.0 million with a fixed interest rate of 3.75% due in 2026 (the "Convertible Notes"). The Convertible Notes were issued at par and require interest payments semi-annually in arrears on June 15^th and December 15^th of each year. The Convertible Notes are unsecured obligations and rank equally with all other unsecured and unsubordinated indebtedness. The Convertible Notes have an effective interest rate of 6.03% after giving effect to the accounting treatment required by ASC Topic 470-20, "Debt with Conversion and Other Options." Holders of the Convertible Notes may require the Company to repurchase the Convertible Notes at par on December 15, 2016 and December 15, 2021. Through June 30, 2013, the Company had purchased $114.1 million in principal amount of its Convertible Notes, none of which were repurchased subsequent to December 31, 2011, and the remaining outstanding balance is $0.9 million. As of December 31, 2011, all loan costs associated with the issuance have been expensed and there is no remaining net carrying amount of the equity component. The if-converted value of the Convertible Notes does not exceed their aggregate principal amount as of June 30, 2013 and there are no derivative transactions that were entered into in connection with the issuance of the Convertible Notes.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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