Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Stock Performance Rights [Abstract]

Stock Performance Rights

Stock Performance Rights ("SPRs")

Restricted Stock Awards

Restricted Stock Awards ("RSAs")

The Company 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

Market Stock Units ("MSUs")