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DEBT (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
DEBT
Weighted average interest rate, after giving effect to interest rate derivatives (as a percent)	5.27%	5.15%
Fixed-rate debt	$ 398,225	$ 229,587
Variable-rate debt	2,030	83,026
Total	$ 400,255	$ 312,613

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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