EQUITY-BASED AWARDS - Acquisition Related LTIP Units (Details) - LTIP units [Member] - 2013 Long-Term Incentive Plan [Member] - Participating Regional Operator [Member] - shares |
12 Months Ended | ||
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Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Number of LTIP units | |||
| Unvested units at beginning of year (in shares) | 260,400 | 423,800 | 522,900 |
| Vested (in shares) | (36,400) | (45,100) | (99,100) |
| Forfeited (in shares) | (118,300) | ||
| Unvested units at end of year (in shares) | 224,000 | 260,400 | 423,800 |
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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