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SHARE-BASED COMPENSATION - Summary (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 12, 2018 $ / shares shares | Feb. 07, 2017 $ / shares shares | Dec. 31, 2018 USD ($) installment plan $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of share-based compensation plans (shares) | plan |  |  | 1 |  |
Number of shares authorized (shares) |  |  | 10,400,000 |  |
Award vesting period |  |  | 5 years |  |
Share-based compensation expense | $ |  |  | $ 3,744 | $ 3,907 | $ 4,681
Share-based compensation cost capitalized as part of real estate assets | $ |  |  | 287 | $ 405 | $ 351
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  | $ 4,596 |  |
Compensation cost to be recognized over a weighted average period |  |  | 2 years 6 months |  |
Restricted Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Nonvested, beginning of period (shares) |  |  | 642,359 |  |
Granted (shares) |  |  | 693,064 |  |
Vested (shares) |  |  | (443,159) |  |
Forfeited (shares) |  |  | (16,767) |  |
Nonvested, end of period (shares) |  |  | 875,497 | 642,359 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Weighted average grant-date fair value, nonvested, beginning of period (USD per share) | $ / shares |  |  | $ 13.23 |  |
Weighted average grant-date fair value, granted (USD per share) | $ / shares |  |  | 4.55 | $ 10.75 | $ 10.02
Weighted average grant-date fair value, vested (USD per share) | $ / shares |  |  | 10.15 |  |
Weighted average grant-date fair value, forfeited (USD per share) | $ / shares |  |  | 9.10 |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares |  |  | $ 7.99 | $ 13.23 |
Total fair value of shares vested | $ |  |  | $ 2,189 | $ 2,791 | $ 2,605
Vesting rate (as a percent) |  |  | 20.00% |  |
Number of annual installments (installment) | installment |  |  | 4 |  |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 1,364 | $ 1,501 | $ 1,033
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Nonvested, beginning of period (shares) |  |  | 560,371 |  |
Granted (shares) |  |  | 741,977 | 277,376 | 282,995
Canceled (shares) |  |  | (252,538) |  |
Forfeited (shares) |  |  | (138,899) |  |
Nonvested, end of period (shares) |  |  | 910,911 | 560,371 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Weighted average grant-date fair value, nonvested, beginning of period (USD per share) | $ / shares |  |  | $ 5.91 |  |
Weighted average grant-date fair value, granted (USD per share) | $ / shares |  |  | 2.63 | $ 6.86 | $ 4.98
Weighted average grant-date fair value, canceled (USD per share) | $ / shares |  |  | 4.41 |  |
Weighted average grant-date fair value, forfeited (USD per share) | $ / shares |  |  | 4.22 |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 4.76 | $ 6.86 | $ 4.67 | $ 5.91 |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  | $ 1,594 |  |
Compensation cost to be recognized over a weighted average period |  |  | 3 years 2 months |  |
Service period |  |  | 3 years |  |
Number of shares authorized to be granted annually (shares) |  |  | 200,000 |  |
Shares granted in period classified as liabilities (shares) |  |  | 381,749 |  |
Risk-free interest rate (as a percent) | 2.36% | 1.53% |  |  |
Expected share price volatility (as a percent) | 42.02% | 32.85% |  |  |
Performance Shares | Chief Executive Officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (shares) | 240,164 | 115,082 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 3.13 | $ 5.62 |  |  |
Performance Shares | Officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (shares) | 120,064 | 162,294 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 1.63 | $ 7.74 |  |  |
Performance Shares | Vested at conclusion of performance period |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Vesting rate (as a percent) |  |  | 60.00% |  |
Performance Shares | Remaining percentage after performance period |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Vesting rate (as a percent) |  |  | 40.00% |  |
Performance Shares | Vested each year for the first two anniversaries after conclusion of performance period |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Vesting rate (as a percent) |  |  | 20.00% |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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