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Debt - Net (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument
Total debt, gross	$ 1,125,636,000	$ 1,034,956,000
Net premium	156,000	2,403,000
Total	1,125,792,000	1,037,359,000
Unsecured term loans
Debt Instrument
Total debt, gross	455,000,000	455,000,000
Unsecured senior notes
Debt Instrument
Total debt, gross	300,000,000	0
Fixed rate mortgages
Debt Instrument
Total debt, gross	370,636,000	382,456,000
Secured real estate term loan
Debt Instrument
Total debt, gross	0	125,500,000
Unsecured revolving credit facility
Debt Instrument
Line of credit facility, amount outstanding	$ 0	$ 72,000,000

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

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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