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Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available under the Stock Incentive Plan | 1,900,000 |  |
Amortization related to restricted stock/Unit awards and LTIP Unit Awards | $ 8,611 | $ 7,371 | $ 7,177
Unrecognized compensation related to unvested restricted stock/Unit awards and LTIP Unit Awards | $ 7,752 |  |
Weighted average period of unrecognized compensation expected to be recognized | 10 months 16 days |  |
Matching contributions in 401(k)/profit sharing plan | $ 518 | $ 509 | $ 471
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 | 260,685 | 308,373 | 216,975
Fair Value of restricted stock/Unit awards and LTIP Unit Awards issued | $ 6,871 | $ 6,047 | $ 4,708
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 | $ 1,352
Management | LTIP Unit Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock/Unit Awards and LTIP Unit Awards issued | 195,951 | 254,524 |
Fair Value of restricted stock/Unit awards and LTIP Unit Awards issued | $ 2,473 | $ 2,561 |
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 | 15,108 | 14,460 | 17,385
Fair Value of restricted stock/Unit awards and LTIP Unit Awards issued | $ 420 | $ 350 | $ 350
Vesting period of restricted stock/Unit awards and LTIP Unit Awards issued | 1 year |  |

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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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