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DEBT (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt
Fixed-rate debt	$ 474,428	$ 358,590
Variable-rate debt	92,968	76,999
Total debt	$ 567,396	$ 435,589
Weighted average
Debt
Weighted average interest rate, after giving effect to interest rate derivatives (as a percent)	4.61%	5.03%

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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