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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Common Shares, Share Repurchases, Dividends and Distributions (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 11, 2018 | Feb. 27, 2018 | Nov. 08, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | May 10, 2017 | May 09, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common shares, authorized (in shares) |  |  |  | 200,000,000 | 200,000,000 |  | 200,000,000 | 200,000,000 | 100,000,000
Authorized amount |  |  |  | $ 200,000,000.0 | $ 200,000,000.0 |  |  |  |
Number of shares repurchased during period (in shares) |  |  |  | 990,041 | 2,294,235 |  | 0 |  |
Shares repurchased during period |  |  |  | $ 23,100,000 | $ 55,057,000 |  |  |  |
Stock repurchase fees |  |  |  |  | 100,000 |  |  |  |
Remaining authorized repurchase amount |  |  |  | $ 145,000,000 | $ 145,000,000 |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  | $ 0.54 | $ 0.52 |  |  |
Restricted shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock, shares canceled for tax withholding for share based compensation (in shares) |  |  |  |  | 3,288 |  | 4,314 |  |
LTIP Units and Restricted Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Unit based compensation |  |  |  |  | $ 4,300,000 |  | $ 8,400,000 |  |
Regular Quarterly Cash Dividend |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.27 | $ 0.27 | $ 0.27 |  |  |  |  |  |
Cash dividends declared, period increase (in dollars per share) |  |  | $ 0.01 |  |  |  |  |  |

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