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Common Stock and Other Equity Related Transactions - Narratives (Details) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 15, 2019 | May 10, 2016 USD ($) | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 $ / shares shares | Apr. 30, 2019 shares | Apr. 29, 2019 shares | Oct. 26, 2018 USD ($) $ / shares
Class of Stock |  |  |  |  |  |  |  |
Common stock, shares authorized (shares) |  |  | 400,000,000 | 200,000,000 |  | 400,000,000 | 200,000,000 |
Stock split ratio | 2 |  |  |  |  |  |  |
Par or stated value per share (usd per share) | $ / shares |  |  | $ 0.01 | $ 0.01 |  |  |  |
ESPP, purchase price discount (in percentage) |  | 85.00% |  |  |  |  |  |
ESPP, issued during the period (in shares) |  |  | 40,934 | 44,142 | 49,430 |  |  |
ESPP, shares remaining for distribution (shares) |  |  | 774,579 |  |  |  |  |
Units of partnership interest (in shares) |  |  | 10,491,222 | 11,491,932 | 11,668,200 |  |  |
Share based payment award repurchased shares for taxes (usd per share) | $ / shares |  |  | $ 47.48 | $ 48.12 | $ 44.51 |  |  |
Percentage of ownership interests (in percentage) |  |  | 94.60% | 94.00% | 93.80% |  |  |
Ownership percentage by noncontrolling owners (in percentage) |  |  | 5.40% | 6.00% | 6.20% |  |  |
Maximum |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
ESPP authorized amount | $ |  | $ 250,000 |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Par or stated value per share (usd per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01
Aggregate offering price | $ |  |  |  |  |  |  |  | $ 200,000,000.0
Shares available for issuance (shares) |  |  | 140,700,000 |  |  |  |  |

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- Definition Common stock purchased through our Employee Stock Purchase Program can be purchased at a price equal to 85% of the lesser of: (a) the closing price for a share of common stock on the last day of the offering period; and (b) the closing price for a share of common stock on the first day of the offering period. + References No definition available. + Details
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