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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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Jan. 11, 2019 | Oct. 12, 2018 | Jul. 13, 2018 | Apr. 13, 2018 | Jan. 12, 2018 | Oct. 13, 2017 | Jul. 14, 2017 | Apr. 14, 2017 | Jan. 13, 2017 | Oct. 14, 2016 | Jul. 08, 2016 | Apr. 08, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units of partnership interest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 5,745,966 | 5,834,100 | 7,170,000
Common Stock Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding at January 1, (shares) |  |  |  |  |  |  |  |  |  |  |  |  | 88,585,160 | 85,529,386 | 84,253,065
Common stock issued through the At-The-Market Offering Program (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 861,141 | 1,380,017 | 683,548
Common stock issued through conversion of OP Units (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 88,134 | 1,335,900 | 37,678
Common stock issued through exercise of options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 202,800 | 220,000 | 440,000
Common stock issued through restricted stock grants (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 130,426 | 133,717
Common stock forfeitures (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (990) | 0
Common stock issued through ESPP and Dividend Reinvestment Plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 22,572 | 25,101 | 17,373
Common stock repurchased and retired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | (31,294) | (34,680) | (35,995)
Shares outstanding at December 31, (shares) |  |  |  |  |  |  |  |  |  |  |  |  | 89,921,018 | 88,585,160 | 85,529,386
Share based payment award repurchased shares for taxes (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 96.23 | $ 89.02 | $ 72.22
Percentage of ownership interests (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 94.00% | 93.80% | 92.30%
Ownership percentage by noncontrolling owners (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 6.20% | 7.70%
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) |  | $ 0.55 | $ 0.55 | $ 0.55 | $ 0.4875 | $ 0.4875 | $ 0.4875 | $ 0.4875 | $ 0.4250 | $ 0.4250 | $ 0.4250 | $ 0.4250 | $ 0.487 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) | $ 0.55 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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