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Share-Based Compensation - Summary (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 12, 2018 $ / shares shares | Feb. 07, 2017 $ / shares shares | Feb. 10, 2016 $ / shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) installment $ / shares shares | Sep. 30, 2017 USD ($) | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized under plan (shares) |  |  |  | 10,400,000 |  | 10,400,000 |  |
Share-based compensation cost capitalized as part of real estate assets | $ |  |  |  | $ 36 | $ 94 | $ 260 | $ 308 |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  |  | $ 5,443 |  | $ 5,443 |  |
Compensation cost to be recognized over a weighted-average period |  |  |  |  |  | 2 years 6 months 25 days |  |
Number of shares authorized to be granted annually (shares) |  |  |  | 200,000 |  | 200,000 |  |
Vested at conclusion of performance period |  |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Vesting rate (as a percent) |  |  |  |  |  | 60.00% |  |
Remaining percentage after performance period |  |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Vesting rate (as a percent) |  |  |  |  |  | 40.00% |  |
Vested each year for the first two anniversaries after conclusion of performance period |  |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Vesting rate (as a percent) |  |  |  |  |  | 20.00% |  |
Restricted Stock Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 787 | 812 | $ 3,263 | 3,175 |
Shares |  |  |  |  |  |  |  |
Nonvested, beginning of period (shares) |  |  |  |  |  | 642,359 |  |
Granted (shares) |  |  |  |  |  | 693,064 |  |
Vested (shares) |  |  |  |  |  | (413,032) |  |
Forfeited (shares) |  |  |  |  |  | (8,852) |  |
Nonvested, end of period (shares) |  |  |  | 913,539 |  | 913,539 |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
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 |  |
Weighted-average grant date fair value, vested (USD per share) | $ / shares |  |  |  |  |  | 9.64 |  |
Weighted-average grant date fair value, forfeited (USD per share) | $ / shares |  |  |  |  |  | 9.36 |  |
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares |  |  |  | $ 8.30 |  | $ 8.30 |  |
Number of annual installment for awards to vest (installment) | installment |  |  |  |  |  | 4 |  |
Restricted Stock Awards | Vested on date of grant |  |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Vesting rate (as a percent) |  |  |  |  |  | 20.00% |  |
Performance Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 178 | $ 386 | $ 1,130 | $ 1,115 |
Shares |  |  |  |  |  |  |  |
Nonvested, beginning of period (shares) |  |  |  |  |  | 560,371 |  |
Granted (shares) |  |  |  |  |  | 741,977 |  |
Forfeited (shares) |  |  |  |  |  | (138,899) |  |
Nonvested, end of period (shares) |  |  |  | 1,163,449 |  | 1,163,449 |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
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 |  |
Weighted-average grant date fair value, forfeited (USD per share) | $ / shares |  |  |  |  |  | 4.22 |  |
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares | $ 4.76 | $ 6.86 | $ 4.98 | $ 4.55 |  | $ 4.55 |  |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  |  | $ 3,141 |  | $ 3,141 |  |
Compensation cost to be recognized over a weighted-average period |  |  |  |  |  | 3 years 7 months 40 days |  |
Performance period |  |  |  |  |  | 3 years |  | 3 years
Risk-free interest rate (as a percent) | 2.36% | 1.53% | 0.92% |  |  |  |  |
Expected share price volatility (as a percent) | 42.02% | 32.85% | 30.95% |  |  |  |  |
Total stockholder return to the national association of real estate investment trusts retail index (as a percent) |  |  |  |  |  | 66.67% |  |
Absolute total stockholder return metrics (as a percent) |  |  |  |  |  | 33.33% |  |
Performance Stock Units | Chief Executive Officer |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |
Granted (shares) | 240,164 | 115,082 |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares | $ 3.13 | $ 5.62 |  |  |  |  |  |
Performance Stock Units | Officer |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |
Granted (shares) | 120,064 | 162,294 |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares | $ 1.63 | $ 7.74 |  |  |  |  |  |

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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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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -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 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 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 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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