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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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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |
Units of partnership interest (in shares) | 5,834,100 | 7,170,000 | 7,207,678
Common Stock Outstanding [Roll Forward] |  |  |
Shares outstanding at January 1, (shares) | 85,529,386 | 84,253,065 | 83,879,779
Common stock issued through the At-The-Market Offering Program (in shares) | 1,380,017 | 683,548 | 0
Common stock issued through conversion of OP Units (in shares) | 1,335,900 | 37,678 | 24,289
Common stock issued through exercise of options (in shares) | 220,000 | 440,000 | 220,000
Common stock issued through stock grants | 130,426 | 133,717 | 158,014
Common stock forfeitures | (990) | 0 | 0
Common stock issued through ESPP and Dividend Reinvestment Plan (in shares) | 25,101 | 17,373 | 20,133
Common stock repurchased and retired (in shares) | (34,680) | (35,995) | (49,150)
Shares outstanding at December 31, (shares) | 88,585,160 | 85,529,386 | 84,253,065
Share based payment award repurchased shares for taxes (usd per share) | $ 89.02 | $ 72.22 | $ 66.20
Percentage of ownership interests (in percentage) | 93.80% | 92.30% |
Ownership percentage by noncontrolling owners (in percentage) | 6.20% | 7.70% |

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