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Equity Incentive Plan - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Jan. 15, 2017 shares | Jan. 28, 2016 $ / shares shares | Jun. 01, 2015 measurement $ / shares shares | Jun. 04, 2014 officer shares | Sep. 30, 2013 officer shares | Sep. 30, 2013 officer shares | May 17, 2013 shares | Sep. 09, 2010 shares | Apr. 21, 2010 shares | Jan. 31, 2016 shares | Jan. 31, 2015 shares | Jan. 31, 2014 shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense valuation of performance-based shares (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.21 | $ 13.17
Total unrecognized compensation cost related to LTIP Units | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600 | $ 2,200 |
Independent Trustees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustee fees | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | 100 | $ 80
Common shares issued as compensation for services performed (in shares) |  |  |  |  |  |  |  |  |  | 26,488 | 14,113 | 16,542 |  |  |
Independent Trustees | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued as compensation for services performed (in shares) | 23,980 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustee fees paid in shares (up to 100%) (at least 50%) (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustee fees paid in shares (up to 100%) (at least 50%) (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |
Equity Incentive Plan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period for share awards under equity |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Equity Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period for share awards under equity |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Class A Performance LTIP Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, portion upon declaration (in percentage) |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Dividends, portion upon fully vested (in percentage) |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |
Distribution entitlement (in percentage) |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
2010 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares available for issuance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,922 |  |
Number of trading days preceding the reporting date for which average of closing price of common shares is taken |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |
Time-based Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Performance-based Restricted Stock Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 900 | 2,100 |
Weighted - average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 1 month 6 days |  |
Compensation expense recognized | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300 | $ 1,600 | $ 1,300
Shares granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 85,254 | 87,018
Long Term Incentive Plan Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period for share awards under equity |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Weighted - average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 2 months 13 days |  |
Compensation expense recognized | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 | $ 700 | $ 800
Exchange ratio |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Shares granted (in shares) |  |  |  |  |  |  |  | 26,250 | 246,960 |  |  |  | 112,251 | 183,300 | 0
Shares forfeited (in shares) |  |  |  |  |  |  |  | 15,435 |  |  |  |  |  |  |
Percent of units with full parity that have vested |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Initial award vesting rights (in percentage) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Annual award vesting rights after initial portion (in percentage) |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Termination period upon change in control |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |
LTIP units achieving full parity (in shares) |  |  |  | 231,525 | 26,250 | 26,250 |  |  |  |  |  |  |  |  |
Number of recipients | officer |  |  |  | 2 | 1 | 1 |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units | Initial Vesting Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units | 1st Anniversary After Initial Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units | 2nd Anniversary After Initial Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units | Awarded June 1, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  | 183,300 |  |  |  |  |  |  |  |  |  |  |  |
Number of performance measurements | measurement |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares |  |  | $ 14.13 |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Absolute TSR Component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of awards granted (in percentage) |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Absolute TSR Component | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of awards to be granted if conditions are met (in percentage) |  |  | 37.50% |  |  |  |  |  |  |  |  |  |  |  |
Total shareholder return threshold (in percentage) |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Absolute TSR Component | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total shareholder return threshold (in percentage) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Relative TSR Component |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of awards granted (in percentage) |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Relative TSR Component | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of awards to be granted if conditions are met (in percentage) |  |  | 37.50% |  |  |  |  |  |  |  |  |  |  |  |
Index percentile threshold |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Relative TSR Component | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Index percentile threshold |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Time-Based | Awarded January 28, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  | 72,966 |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares |  | $ 16.69 |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution entitlement (in percentage) |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based | Awarded January 28, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  | 39,285 |  |  |  |  |  |  |  |  |  |  |  |  |
Total shareholder return threshold (in percentage) |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares |  | $ 11.09 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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