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Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available under the Stock Incentive Plan | 1,600,000 |  |
Amortization related to restricted stock/Unit awards and LTIP Unit Awards | $ 7,586 | $ 8,611 | $ 7,371
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 472 |  |
Unrecognized compensation related to unvested restricted stock/Unit awards and LTIP Unit Awards | $ 8,306 |  |
Weighted average period of unrecognized compensation expected to be recognized | 10 months 16 days |  |
Matching contributions in 401(k)/profit sharing plan | $ 688 | $ 518 | $ 509
LTIP Unit Awards | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage of LTIP Unit Awards | 0.00% |  |
LTIP Unit Awards | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage of LTIP Unit Awards | 100.00% |  |
Management | Restricted Stock/Unit Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock/Unit Awards and LTIP Unit Awards issued | 211,890 | 260,685 | 308,373
Fair Value of restricted stock/Unit awards and LTIP Unit Awards issued | $ 6,068 | $ 6,871 | $ 6,047
Vesting period of restricted stock/Unit awards and LTIP Unit Awards issued | 3 years |  |
Compensation expense recognized at date of grant |  | $ 1,590 | $ 1,710
Management | LTIP Unit Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock/Unit Awards and LTIP Unit Awards issued | 179,288 | 195,951 |
Fair Value of restricted stock/Unit awards and LTIP Unit Awards issued | $ 2,381 | $ 2,473 |
Vesting period of restricted stock/Unit awards and LTIP Unit Awards issued | 3 years |  |
Director | Restricted Stock/Unit Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock/Unit Awards and LTIP Unit Awards issued | 15,169 | 15,108 | 14,460
Fair Value of restricted stock/Unit awards and LTIP Unit Awards issued | $ 490 | $ 420 | $ 350
Vesting period of restricted stock/Unit awards and LTIP Unit Awards issued | 1 year |  |

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- Definition The fair value at approval date of non-option equity instruments granted during the period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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