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

The Company recorded stock-based compensation expense of $7.6 million and $8.7 million for the first nine 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 nine months ended September 30, 2019 follows:

Stock Performance Rights ("SPRs")
The Company issued 26,825 SPRs to key employees with an exercise price of $30.78 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 17,340 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 41,219 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 61,829, 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 and nine months ended September 30, 2019. For the three months ended September 30, 2018, the effect of restricted stock awards, market stock units and future stock option exercises equivalent of approximately 403,000 shares of the Company's common stock were excluded from the computation of diluted earnings per share because they were anti-dilutive. For the nine months ended September 30, 2018, stock options to purchase approximately 46,000 shares of the Company's common stock were excluded from the computation of diluted earnings per share because they were anti-dilutive.