Stock-Based Compensation - Stock-Based Compensation Expense By Award Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from employee stock purchase plan	$ 17,629	$ 14,689	$ 11,711
Stock-based compensation expense	69,000	66,200	78,900
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	6,700	6,300	5,600
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	61,600	59,200	72,600
Common stock equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 700	$ 700	$ 700