Stock-Based Compensation, Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	$ 9,909	$ 26,609	$ 19,314
Stock Options [Member]
Unrecognized Stock-Based Compensation Expense [Abstract]
Unrecognized stock-based compensation expense	$ 300
Unrecognized stock-based compensation expense, period for recognition	1 month 6 days
Restricted Stock Awards [Member]
Unrecognized Stock-Based Compensation Expense [Abstract]
Unrecognized stock-based compensation expense	$ 21,800
Unrecognized stock-based compensation expense, period for recognition	2 years 7 months 6 days
Service-Based Options [Member]
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	$ 2,600	3,100	4,000
Service-Based Restricted Stock Units [Member]
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	11,500	11,200	11,300
Performance-Based Options [Member]
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	(4,100)	12,200	(3,900)
Performance Stock Units [Member]
Stock-Based Compensation Expense [Abstract]
Stock-based compensation expense (income)	$ 100	$ 100	$ 100