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Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt
Fixed-rate debt	$ 469,604	$ 358,590
Variable-rate debt	154,699	76,999
Total debt	$ 624,303	$ 435,589
Cash flow hedges \| Interest rate derivatives
Debt
Weighted average interest rate	4.40%	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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