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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Common Shares, Share Repurchases and Dividends and Distributions (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 27, 2018 | Nov. 08, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | May 10, 2017 | May 09, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Common shares, authorized (in shares) |  |  | 200,000,000 |  | 100,000,000 | 200,000,000 | 100,000,000
Authorized amount |  |  | $ 200,000,000.0 |  |  |  |
Number of shares repurchased during period (in shares) |  |  | 1,304,194 |  | 0 |  |
Shares repurchased during period |  |  | $ 31,961,000 |  |  |  |
Remaining authorized repurchase amount |  |  | $ 168,000,000 |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  | $ 0.27 | $ 0.26 |  |  |
Restricted Stock |  |  |  |  |  |  |
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 |  |  |  |  | $ 8,400,000 |  |
Regular Quarterly Cash Dividend |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash dividends declared, period increase (in dollars per share) |  | $ 0.01 |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.27 | $ 0.27 |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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