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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Common Shares, Share Repurchases and Dividends and Distributions (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Nov. 08, 2017 | Nov. 08, 2016 | Nov. 07, 2016 | Jul. 31, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2001 | May 10, 2017 | May 09, 2017 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, authorized (in shares) |  |  |  |  | 200,000,000 |  |  |  | 100,000,000 |  |  |  | 200,000,000 | 100,000,000 |  |  | 200,000,000 | 100,000,000 |
Authorized amount |  |  |  |  | $ 20,000,000.0 |  |  |  |  |  |  |  | $ 20,000,000.0 |  |  |  |  |  |
Treasury stock, acquired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | 2,100,000 |  |  |
Remaining authorized repurchase amount |  |  |  |  | $ 7,500,000 |  |  |  |  |  |  |  | $ 7,500,000 |  |  |  |  |  |
Distributions declared (in dollars per share) |  |  |  |  | $ 0.27 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.41 | $ 0.25 | $ 0.25 | $ 0.25 | $ 1.05 | $ 1.16 | $ 1.22 |  |  |  |
ATM Equity Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock, shares authorized not issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock, shares canceled for tax withholding for share based compensation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 4,314 | 3,152 |  |  |  |  |
LTIP Units and Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unit based compensation |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,400,000 | $ 10,900,000 |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,830,000 |  |  |  |  |
Stock issued during period |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,200,000 |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 172,100,000 |  |  |  |  |
Common Shares | Forward Sale and Underwritten Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |  |  |  |
Stock issued during period |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 126,800,000 |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 124,500,000 |  |  |  |  |
Common Shares | ATM Equity Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares, net of issuance costs (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  |
Stock issued during period |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,600,000 |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 155,700,000 |  |  |  |  |
Additional maximum gross proceeds amount |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  | 250,000,000 | 250,000,000.0 |  |  |  |  |
Sale of Stock, remaining value under program |  |  |  |  |  |  |  |  |  |  |  |  | $ 218,000,000 | $ 218,000,000 |  |  |  |  |
Regular Quarterly Cash Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared, period increase (in dollars per share) | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared (in dollars per share) | $ 0.27 | 0.26 | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special Cash Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid (in dollars per share) |  | $ 0.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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