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Common Stock and Other Equity Related Transactions - Common Stock, OP Units, and Distributions (Details) - $ / shares |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Oct. 14, 2016 | Jul. 08, 2016 | Apr. 08, 2016 | Jan. 08, 2016 | Oct. 09, 2015 | Jul. 10, 2015 | Apr. 10, 2015 | Jan. 09, 2015 | Oct. 10, 2014 | Jul. 11, 2014 | Apr. 11, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units of partnership interest (in shares) |  |  |  |  |  |  |  |  |  |  |  | 7,170,000 | 7,207,678 | 7,231,967
Common Stock Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding at January 1, (shares) |  |  |  |  |  |  |  |  |  |  |  | 84,253,065 | 83,879,779 | 83,313,677
Common stock issued through the At-The-Market Offering Program (in shares) |  |  |  |  |  |  |  |  |  |  |  | 683,548 | 0 | 0
Common stock issued through conversion of OP Units (in shares) |  |  |  |  |  |  |  |  |  |  |  | 37,678 | 24,289 | 435,756
Common stock issued through exercise of options (in shares) |  |  |  |  |  |  |  |  |  |  |  | 440,000 | 220,000 | 0
Common stock issued through stock grants (in shares) |  |  |  |  |  |  |  |  |  |  |  | 133,726 | 158,013 | 186,666
Common stock issued through ESPP and Dividend Reinvestment Plan (in shares) |  |  |  |  |  |  |  |  |  |  |  | 17,373 | 20,134 | 31,203
Common stock repurchased and retired (in shares) |  |  |  |  |  |  |  |  |  |  |  | (36,004) | (49,150) | (87,523)
Shares outstanding at December 31, (shares) |  |  |  |  |  |  |  |  |  |  |  | 85,529,386 | 84,253,065 | 83,879,779
Share based payment award repurchased shares for taxes (usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 72.22 | $ 66.20 | $ 51.62
Percentage of ownership interests (in percentage) |  |  |  |  |  |  |  |  |  |  |  | 92.30% | 92.10% |
Ownership percentage by noncontrolling owners (in percentage) |  |  |  |  |  |  |  |  |  |  |  | 7.70% | 7.90% |
Disclosure Regular Quarterly Distributions Declared And Paid To Common Stockholders And Common O P Unit Non Controlling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Amount Per Share (usd per share) | $ 0.425 | $ 0.425 | $ 0.425 | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.325 | $ 0.325 | $ 0.325 | $ 0.325 |  |  |

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- Definition Disclosure - Regular Quarterly Distributions Declared and Paid to Common Stockholders and Common OP Unit Non-Controlling Interests [Abstract] + References No definition available. + Details
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