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Common Stock and Other Equity Related Transactions Common Stock and Other Equity Related Transactions - Common Stock, OP Units, and Distributions (Details) - $ / shares | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units of Partnership Interest, Amount | 7,207,678 |  |  |  | 7,231,967 |  |  |  | 7,667,723 |  |  |  | 7,207,678 | 7,231,967 | 7,667,723
Common Stock Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding at January 1, |  |  |  | 83,879,779 |  |  |  | 83,313,677 |  |  |  | 83,193,310 | 83,879,779 | 83,313,677 | 83,193,310
Common stock issued through conversion of OP Units |  |  |  |  |  |  |  |  |  |  |  |  | 24,289 | 435,756 | 29,566
Common stock issued through exercise of options |  |  |  |  |  |  |  |  |  |  |  |  | 220,000 | 0 | 20,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  |  |  |  |  |  |  |  |  |  |  | 158,013 | 186,666 | 173,332
Common stock issued through ESPP and Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  | 20,134 | 31,203 | 19,013
Common stock repurchased and retired |  |  |  |  |  |  |  |  |  |  |  |  | 49,150 | 87,523 | 121,544
Shares outstanding at December 31, | 84,253,065 |  |  |  | 83,879,779 |  |  |  | 83,313,677 |  |  |  | 84,253,065 | 83,879,779 | 83,313,677
Share Based Compensation Arrangement By Share Based Payment Award Repurchased Shares For Taxes |  |  |  |  |  |  |  |  |  |  |  |  | $ 66.20 | $ 51.62 | $ 36.48
Percentage Of Ownership Interests | 92.10% |  |  |  | 92.10% |  |  |  |  |  |  |  | 92.10% | 92.10% |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 7.90% |  |  |  | 7.90% |  |  |  |  |  |  |  | 7.90% | 7.90% |
Disclosure Regular Quarterly Distributions Declared And Paid To Common Stockholders And Common O P Unit Non Controlling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.325 | $ 0.325 | $ 0.325 | $ 0.325 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 |  |  |
Dividends Payable, Date of Record | Dec. 28, 2015 | Sep. 25, 2015 | Jun. 26, 2015 | Mar. 27, 2015 | Dec. 26, 2014 | Sep. 26, 2014 | Jun. 27, 2014 | Mar. 28, 2014 | Dec. 27, 2013 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 28, 2013 |  |  |
Dividends Payable, Date to be Paid | Jan. 08, 2016 | Oct. 09, 2015 | Jul. 10, 2015 | Apr. 10, 2015 | Jan. 09, 2015 | Oct. 10, 2014 | Jul. 11, 2014 | Apr. 11, 2014 | Jan. 10, 2014 | Oct. 11, 2013 | Jul. 12, 2013 | Apr. 12, 2013 |  |  |

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