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Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 1 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Senior unsecured notes 6.75% | Jul. 31, 2012 Senior unsecured notes 6.75% | Dec. 31, 2011 Senior unsecured notes 6.75% | Apr. 30, 2010 Senior unsecured notes 6.75% | Dec. 31, 2012 Mortgage financing closed in August 2009 | Dec. 31, 2011 Mortgage financing closed in August 2009 | Dec. 31, 2010 Mortgage financing closed in August 2009 | Dec. 31, 2012 Previous unsecured revolving credit facility | Dec. 31, 2011 Previous unsecured revolving credit facility | Dec. 31, 2010 Previous unsecured revolving credit facility | Jun. 30, 2011 Previous unsecured revolving credit facility | Dec. 31, 2012 Unsecured revolving credit facility | Jun. 30, 2011 Unsecured revolving credit facility | Aug. 31, 2012 Mortgages | Dec. 31, 2012 Mortgages | Oct. 31, 2012 Mortgages | Jun. 30, 2012 Mortgages | Feb. 29, 2012 Mortgages | Dec. 31, 2011 Mortgages | Apr. 30, 2010 Mortgages | Dec. 31, 2011 Senior unsecured notes 7.875%
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance costs capitalized | $ 12,608 | $ 13,760 | $ 4,661 | $ 44 | $ 11,439 |  | $ 2,907 |  | $ 37 | $ 903 |  |  | $ 826 |  |  | $ 6,723 |  | $ 1,125 |  |  |  | $ 2,540 | $ 25 | $ 1,973
Principal amount of debt |  |  |  | 200,000 | 350,000 | 200,000 | 200,000 |  | 512,934 | 512,934 |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000
Early repayment of debt variable portion |  |  |  |  |  |  |  | 199,197 |  |  |  |  |  |  |  |  | 199,197 |  |  |  |  |  |  |
Period by which revolving credit facility has been extended |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of line of credit facility |  |  |  |  |  |  |  |  |  |  |  |  | 550,000 | 550,000 | 750,000 | 750,000 |  |  |  |  |  |  |  |
Deferred financing fees and unamortized discounts written off |  |  |  |  |  |  |  |  |  |  | 3,897 | 427 | 1,153 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 6.75% |  | 6.75% |  |  |  |  |  |  | 7.875% |  |  |  | 6.40% |  | 6.50% | 6.07% | 6.03% |  |  |
Unamortized gross balance of deferred financing fees | 39,471 | 36,144 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization related to deferred financing fees | 10,061 | 10,710 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period of deferred financing fees | 14 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2013 | 4,748 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2014 | 4,695 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2015 | 3,621 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2016 | 2,170 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2017 | 1,861 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense thereafter | $ 12,315 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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