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Fair Value - Additional Information (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Measurements [Line Items]
Long term debt, carrying amount	$ 910,128,000us-gaap_LongTermDebt	$ 921,705,000us-gaap_LongTermDebt
Level 2 \| Fixed Rate Mortgages
Fair Value Measurements [Line Items]
Long term debt, carrying amount	873,600,000	874,700,000
Long term debt, fair value	901,100,000	900,900,000
Level 2 \| Floating Rate Debt
Fair Value Measurements [Line Items]
Long term debt, carrying amount	$ 28,100,000	$ 38,100,000

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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