Stockholders' Equity Common Stock Repurchase (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Common Stock Repurchase [Abstract]
Stock Repurchase Program, Authorized Amount	$ 250,000
Stock Repurchased and Retired During Period, Shares	2,100,000
Weighted Average Selling Price Per Share	$ 34.65
Stock Repurchased and Retired During Period, Value	$ 71,600	$ 120,200