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Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 1 Months Ended |  |  | 12 Months Ended |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 Y | Dec. 31, 2010 | Dec. 31, 2011 Senior unsecured notes 6.75% | Apr. 30, 2010 Senior unsecured notes 6.75% | Dec. 31, 2011 Mortgage financing closed in August 2009 | Dec. 31, 2010 Mortgage financing closed in August 2009 | Dec. 31, 2011 Previous unsecured revolving credit facility | Jun. 30, 2011 Previous unsecured revolving credit facility | Dec. 31, 2010 Previous unsecured revolving credit facility Y | Dec. 31, 2011 Unsecured revolving credit facility | Jun. 30, 2011 Unsecured revolving credit facility | Dec. 31, 2011 Mortgages | Apr. 30, 2010 Mortgages | May 31, 2010 Senior unsecured notes 7.875% | Dec. 31, 2010 Senior unsecured notes 7.875% | Dec. 31, 2011 Senior unsecured notes 7.875%
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance costs capitalized | $ 13,760 | $ 4,661 | $ 2,487 | $ 2,907 | $ 37 | $ 903 |  |  | $ 826 |  | $ 6,723 | $ 2,540 | $ 25 |  |  | $ 1,973
Principal amount of debt |  |  | 300,000 | 200,000 | 512,934 | 512,934 |  |  |  |  |  |  |  |  |  | 250,000
Period by which revolving credit facility has been extended (in years) |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Maximum borrowing capacity of line of credit facility | 1,500,000 |  |  |  |  |  |  | 550,000 | 550,000 | 750,000 | 750,000 |  |  |  |  |
Deferred financing fees and unamortized discounts written off |  |  |  |  |  |  | 427 |  |  |  |  |  |  | 1,153 | 1,153 |
Stated interest rate (as a percent) |  |  | 6.75% | 6.75% |  |  |  |  |  |  |  |  |  |  | 7.875% |
Unamortized gross balance of deferred financing fees | 36,144 | 28,159 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization related to deferred financing fees | 10,710 | 11,897 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period of deferred financing fees (in years) | 6.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt sold |  |  | 300,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2012 | 4,695 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2013 | 4,603 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2014 | 4,543 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2015 | 3,574 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense in 2016 | 2,189 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense after 2016 | $ 5,830 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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