Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Measurement Inputs (Details) - Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology
Remaining performance period as of grant date (in years)	2 years 10 months 24 days	2 years 9 months 18 days
Risk free rate (percent)	2.60%	2.40%
Grant-date fair value (usd per share)	$ 12,910	$ 13,460