Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Valuation Assumptions

The weighted-average estimated value of SPRs outstanding as of December 31, 2020 was $26.88 per SPR using the following assumptions:

Expected volatility	46.5% to 66.9%
Risk-free rate of return	0.1% to 0.2%
Expected term (in years)	0.5 to 3.5
Expected annual dividend	$0

Activity Related to SPRs

Activity related to the Company’s SPRs during the year ended December 31, 2020 was as follows:

	Number of SPRs	Weighted Average Exercise Price
Outstanding on December 31, 2019	599,861	$	26.56
Exercised	(18,861)	16.48
Outstanding on December 31, 2020	581,000	26.88
Exercisable on December 31, 2020	573,086	$	26.72

Activity Related to RSAs

Activity related to the Company’s RSAs during the year ended December 31, 2020 was as follows:

	Restricted Stock Awards
Outstanding on December 31, 2019	90,909
Granted	18,371
Exchanged for common shares	(63,481)
Outstanding on December 31, 2020	45,799

MSU Rollforward

Activity related to the Company’s MSUs during the year ended December 31, 2020 was as follows:

	Number of Market Stock Units	Maximum Shares Potentially Issuable
Outstanding on December 31, 2019	139,643	199,303
Granted	21,648	32,472
Exchanged for stock	(24,035)	(36,052)
Outstanding on December 31, 2020	137,256	195,723