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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Nonvested Share Activity [Table Text Block] | The following table summarizes non-vested restricted stock activity:
|  | Year ended December 31, 2018
|  | Number of Shares |  | Intrinsic Value (in thousands) |  | Weighted Average Grant Price
Non-vested as of December 31, 2017 |  | 570,077 |  |  |  |  |
Time-based awards granted (1) (4) |  | 130,584 |  |  |  |  | $61.66
Performance-based awards granted (2) (4) |  | 14,935 |  |  |  |  | $62.57
Market-based awards granted (3) (4) |  | 113,126 |  |  |  |  | $65.74
Change in market-based awards earned for performance (3) |  | 64,330 |  |  |  |  | $60.34
Vested (5) |  | (287,331 | ) |  |  |  | $60.23
Forfeited |  | (10,550 | ) |  |  |  | $68.65
Non-vested as of December 31, 2018 (6) |  | 595,171 |  |  | $34,925 |  |
(1) Time-based awards vest beginning on the first anniversary following the grant date over a three or four year service period. These grants are subject only to continued employment and are not dependent on future performance measures. Accordingly, if such vesting criteria are not met, compensation cost previously recognized would be reversed.
(2) Performance-based awards are earned subject to future performance measurements. Once the performance criteria are achieved and the actual number of shares earned is determined, shares vest over a required service period. The Company considers the likelihood of meeting the performance criteria based upon management's estimates from which it determines the amounts recognized as expense on a periodic basis.
(3) Market-based awards are earned dependent upon the Company's total shareholder return in relation to the shareholder return of a NAREIT index over a three-year period. Once the performance criteria are met and the actual number of shares earned is determined, the shares are immediately vested and distributed. The probability of meeting the criteria is considered when calculating the estimated fair value on the date of grant using a Monte Carlo simulation. These awards are accounted for as awards with market criteria, with compensation cost recognized over the service period, regardless of whether the performance criteria are achieved and the awards are ultimately earned. The significant assumptions underlying determination of fair values for market-based awards granted were as follows:
|  |  | Year ended December 31,
|  |  | 2018 |  | 2017 |  | 2016
| Volatility |  | 19.20% |  | 18.00% |  | 18.50%
| Risk free interest rate |  | 2.26% |  | 1.48% |  | 0.88%
(4)The weighted-average grant price for restricted stock granted during the years is summarized below:
|  |  | Year ended December 31,
|  |  | 2018 |  | 2017 |  | 2016
| Weighted-average grant price for restricted stock |  | $ | 63.50 |  |  | $ | 72.05 |  |  | $ | 79.40 |
(5) The total intrinsic value of restricted stock vested during the years is summarized below (in thousands):
|  |  | Year ended December 31,
|  |  | 2018 |  | 2017 |  | 2016
| Intrinsic value of restricted stock vested |  | $ | 17,306 |  |  | $ | 14,376 |  |  | $ | 15,400 |
(6) As of December 31, 2018, there was $13.1 million of unrecognized compensation cost related to non-vested restricted stock granted under the Parent Company's Plan. When recognized, this compensation results in additional paid in capital in the accompanying Consolidated Statements of Equity of the Parent Company and in general partner preferred and common units in the accompanying Consolidated Statements of Capital of the Operating Partnership. This unrecognized compensation cost is expected to be recognized over the next three years. The Company issues new restricted stock from its authorized shares available at the date of grant.
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The Company recorded stock-based compensation in general and administrative expenses in the accompanying Consolidated Statements of Operations, the components of which are further described below:
| Year ended December 31,
(in thousands) | 2018 |  | 2017 |  | 2016
Restricted stock (1) | $ | 16,745 |  |  | 15,525 |  |  | 13,422 |
Directors' fees paid in common stock (1) | 399 |  |  | 303 |  |  | 193 |
Capitalized stock-based compensation (2) | (3,509 | ) |  | (3,210 | ) |  | (2,963 | )
Stock based compensation attributable to post-combination service from Equity One merger | — |  |  | 7,931 |  |  | — |
Stock-based compensation, net of capitalization | $ | 13,635 |  |  | 20,549 |  |  | 10,652 |
(1) Includes amortization of the grant date fair value of restricted stock awards over the respective vesting periods.
(2) Includes compensation expense specifically identifiable to development and leasing activities.
The Company established its Long Term Omnibus Plan (the "Plan") under which the Board of Directors may grant stock options and other stock-based awards to officers, directors, and other key employees. The Plan allows the Company to issue up to 4.1 million shares in the form of the Parent Company's common stock or stock options. As of December 31, 2018, there were 1.2 million shares available for grant under the Plan either through stock options or restricted stock.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + 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 -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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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