Common Stock Stock Repurchase (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jan. 14, 2020	Apr. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Document Period End Date	Mar. 31, 2021
Stock Repurchase Program, Authorized Amount			$ 525,000	$ 200,000
Payments for Repurchase of Common Stock	$ 2,356	$ 7,693
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Payments for Repurchase of Common Stock	$ 2,356	$ 7,693
Treasury Stock, Common [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Shares	598,000	1,266,000
Payments for Repurchase of Common Stock	$ 22,100	$ 23,800
Treasury Stock remaining to be repurchased	324,700
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Payments for Repurchase of Common Stock	$ 22,100	$ 23,800