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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2018
Share-based Compensation [Abstract] |
Stock-Based Compensation | Stock-Based Compensation A summary of restricted stock transactions during the three months ended March 31, 2018 follows:
| Number of shares
Non-vested stock awards outstanding at January 1, 2018 | 1,053,842 |
Awarded: |
Time-vesting shares | 73,173 |
Performance-based shares | 142,154 |
Released: |
Time-vesting shares | (59,035 | )
Forfeitures: |
Time-vesting shares | (4,575 | )
Performance-based shares | (159,738 | )
Non-vested stock awards outstanding at March 31, 2018 | 1,045,821 |
The performance-based share awards are subject to either a market condition or a performance condition. For awards subject to a market condition, the performance metric is the Company's total shareholder return, which includes share price appreciation and dividends paid during the three-year term of the award, measured against a peer group of companies. These awards cliff vest at the end of three years. The number of performance-based shares that will ultimately vest is based on the level of market performance achieved, ranging between 0% and 200% of the shares originally awarded, and are settled in stock. For awards subject to a performance condition, the performance metric is the Company's average return on invested capital, over the three-year term. These awards cliff vest at the end of three years. The number of performance-based shares that will ultimately vest is based on the level of performance achieved, ranging between 0% and 200% of the shares originally awarded, and are settled in stock. The time-vesting restricted and deferred stock awards vest ratably over three to five years. The weighted average grant-date fair values of awards issued during the three months ended March 31, 2018 were $57.09 for the time-vesting stock awards and $58.77 for the performance-based stock awards. The fair value of the performance-based shares subject to a market condition awarded in 2018 was calculated using a Monte Carlo valuation model, including a weighted average stock price volatility of 19.9%, an expected term of three years, and a weighted average risk-free interest rate of 2.01%. As of March 31, 2018, unrecognized compensation cost related to outstanding non-vested stock awards was $32. The weighted average period over which the expense is expected to be recognized is 1.7 years. The aggregate market value of the shares released on the vesting dates was $3 for the three months ended March 31, 2018.

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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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