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Stock-Based Compensation (Notes)
6 Months Ended
Jun. 30, 2019
Stock Based Compensation [Abstract]  
Stock Performance Rights
Stock-Based Compensation

The Company recorded stock-based compensation expense of $5.2 million and $1.1 million for the first six months of 2019 and 2018, respectively. A portion of stock-based compensation is related to the change in the market value of the Company's common stock.

A summary of stock-based awards issued during the six months ended June 30, 2019 follows:

Stock Performance Rights ("SPRs")
The Company issued 25,793 SPRs to key employees with an exercise price of $30.54 per share that cliff vest on December 31, 2021 and have a termination date of December 31, 2026. SPRs entitle the recipient to receive a cash payment equal to the excess of the market value of the Company's common stock over the SPR exercise price when the SPRs are surrendered.

Restricted Stock Units ("RSUs")
The Company issued 10,045 RSUs to certain members of the Company's Board of Directors with a vesting date of May 14, 2020. The Company issued 16,781 RSUs to key employees that cliff vest on December 31, 2021. Each RSU is exchangeable for one share of the Company's common stock at the end of the vesting period.

Market Stock Units ("MSUs")
The Company issued 39,948 MSUs to key employees that cliff vest on December 31, 2021. MSU's are exchangeable for the Company's common stock at the end of the vesting period. The number of shares of common stock that will be issued upon vesting, ranging from zero to 59,922, will be determined based upon the trailing sixty-day weighted average closing price of the Company's common stock on December 31, 2021.
 
No stock options were excluded from the computation of diluted earnings per share for the three months ended June 30, 2019. For the three months ended June 30, 2018, stock options to purchase approximately 80,000 shares of the Company's common stock were excluded from the computation of diluted earnings per share because they were anti-dilutive. For the six months ended June 30, 2019 and 2018, stock options to purchase approximately 9,524 and 63,210 shares of the Company's common stock were excluded from the computation of diluted earnings per share because they were anti-dilutive.