Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	5,281
Granted (in shares)	1,050
Exercised (in shares)	(674)
Forfeited or expired (in shares)	(114)
Stock Options Shares Outstanding, Ending balance (in shares)	5,543	5,281
Options exercisable (in shares)	3,360
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share)	$ 19.09
Granted, Weighted Average Exercise Price (in usd per share)	22.77
Exercised, Weighted Average Exercise Price (in usd per share)	15.75
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	22.42
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	20.13	$ 19.09
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 18.22
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 3 months	6 years 2 months 4 days
Options exercisable, Weighted Average Remaining Contractual Term	4 years 11 months 12 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 16,043	$ 12,392
Options exercisable, Aggregate Intrinsic Value	$ 14,980