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Stock-Based Compensation (Notes)
 6 Months Ended
Jun. 30, 2018
Stock Based Compensation [Abstract]  
Stock Performance Rights
Stock-Based Compensation

The Company recorded stock-based compensation expense of $1.1 million and a benefit of $385 thousand for the first six months of 2018 and 2017, 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 activity during the six months ended June 30, 2018 follows:

Stock Performance Rights ("SPRs")
The Company issued 44,737 SPRs to key employees with an exercise price of $24.70 per share that cliff vest on December 31, 2020 and have a termination date of December 31, 2025.

Restricted Stock Awards ("RSAs")
The Company issued 26,080 RSAs to members of the Company's Board of Directors with a vesting date of May 15, 2019 and issued 20,059 RSAs to key employees that cliff vest on December 31, 2020. Each RSA 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 32,194 MSUs to key employees that cliff vest on December 31, 2020. 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 48,291, will be determined based upon the trailing sixty-day weighted average closing price of the Company's common stock on December 31, 2020.
 
For the three and six months ended June 30, 2018, stock options to purchase 63,210 shares of the Company's common stock were excluded from the computation of diluted earnings per share because they were anti-dilutive. For the three and six months ended June 30, 2017, stock options to purchase 40,000 shares of the Company's common stock were excluded from the computation of diluted earnings per share because they were anti-dilutive.