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Benefit Plans | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation [Abstract] |
Benefit Plans | Benefit Plans Stock Based Compensation The Company maintains a stock incentive plan (the “Stock Incentive Plan”), which is administered by the Compensation Committee of the Board of Directors. Officers, certain employees and the Company's independent directors generally are eligible to participate in the Stock Incentive Plan. Awards made under the Stock Incentive Plan can be in the form of restricted stock awards, restricted stock unit awards, performance share awards, dividend equivalent rights, non-statutory stock options and stock appreciation rights. Special provisions apply to awards granted under the Stock Incentive Plan in the event of a change in control in the Company. As of December 31, 2017, awards covering 1.9 million shares of common stock were available to be granted under the Stock Incentive Plan. Restricted Stock or Restricted Unit Awards For the years ended December 31, 2017, 2016 and 2015, the Company awarded 260,685, 308,373 and 216,975 shares, respectively, of restricted stock awards to certain employees, which had a fair value of $6,871, $6,047 and $4,708 on the date such awards were approved by either the Compensation Committee of the Board of Directors or the Company's stockholders of the Stock Incentive Plan, as the case may be. These restricted stock awards were granted based upon the achievement of certain corporate performance goals and generally vest over a period of three years. Additionally, during the years ended December 31, 2017, 2016 and 2015, the Company awarded 15,108, 14,460 and 17,385 shares, respectively, of restricted stock to non-employee members of the Board of Directors, which had a fair value of $420, $350 and $350 on the date of approval. These restricted stock awards vest over a one-year period. The Operating Partnership issued restricted Unit awards to the Company in the same amount for both restricted stock awards. Compensation expense is charged to earnings over the vesting periods for the restricted stock or restricted Unit awards expected to vest except if the recipient is not required to provide future service in exchange for vesting of such restricted stock or restricted Unit awards. If vesting of a recipient's restricted stock or restricted Unit awards is not contingent upon future service, the expense is recognized immediately at the date of grant. During the years ended December 31, 2017, 2016 and 2015, we recognized $1,590, $1,710 and $1,352, respectively, of compensation expense related to restricted stock or restricted Unit awards granted to our former Chief Executive Officer for which future service was not required. LTIP Unit Awards For the years ended December 31, 2017 and 2016, the Company granted to certain employees 195,951 and 254,524 Long-Term Incentive Program ("LTIP") performance units ("LTIP Unit Awards"), which had a fair value of $2,473 and $2,561 on the grant date. The LTIP Unit Awards vest based upon the relative total shareholder return ("TSR") of the Company's common stock compared to the TSRs of the MSCI US REIT Index and the NAREIT Industrial Index over a performance period of three years. Compensation expense is charged to earnings on a straight-line basis over the respective performance periods. At the end of the respective performance periods each participant will be issued shares of the Company's common stock equal to the maximum shares issuable to the participant for the performance period multiplied by a percentage, ranging from 0% to 100%, based on the Company's TSR as compared to the TSRs of the MSCI US REIT Index and the NAREIT Industrial Index. The participant is also entitled to dividend equivalents for shares issued pursuant to vested LTIP Unit Awards. The Operating Partnership issues General Partner Units to the Company in the same amounts for vested LTIP Unit Awards. The fair values of the LTIP Unit Awards at issuance were determined by a lattice-binomial option-pricing model based on Monte Carlo simulations using the following assumptions:
| Year Ended December 31, 2017 |  | Year Ended December 31, 2016
Expected dividend yield | 2.71 | % |  | 2.31 | %
Expected volatility - range used | 21.50% - 21.80% |  |  | 21.01% - 21.19% |
Expected volatility - weighted average | 21.68 | % |  | 20.92 | %
Risk-free interest rate | 0.66% - 1.58% |  |  | 0.48% - 1.43% |
Outstanding Restricted Stock or Restricted Unit Awards and LTIP Unit Awards For the years ended December 31, 2017, 2016 and 2015, we recognized $8,611, $7,371 and $7,177, respectively, in amortization related to restricted stock or restricted Unit awards and LTIP Unit Awards. Restricted stock or restricted Unit award and LTIP Unit Award amortization capitalized in connection with development activities was not significant. At December 31, 2017, we had $7,752 in unrecognized compensation related to unvested restricted stock or restricted Unit awards and LTIP Unit Awards. The weighted average period that the unrecognized compensation is expected to be recognized is 0.88 years. Restricted stock or restricted Unit award and LTIP Unit Award transactions for the year ended December 31, 2017 are summarized as follows:
| Awards |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016 | 917,532 |  |  | $ | 14.35 |
Issued | 471,744 |  |  | $ | 20.70 |
Forfeited | (8,034 | ) |  | $ | 19.61 |
Vested | (268,414 | ) |  | $ | 21.36 |
Outstanding at December 31, 2017 | 1,112,828 |  |  | $ | 15.31 |
401(k)/Profit Sharing Plan Under the Company's 401(k)/Profit Sharing Plan, all eligible employees may participate by making voluntary contributions and the Company may make, but is not required to make, matching contributions, which are funded by the Operating Partnership. For the years ended December 31, 2017, 2016 and 2015, total expense related to matching contributions was $518, $509 and $471, respectively.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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