Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended	12 Months Ended
	Jan. 26, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Shares repurchased during period (in shares)		9.6		8.7	16.0
Shares repurchased, weighted average price per share (in dollars per share)		$ 12.47		$ 13.13	$ 10.95
Remaining authorized repurchase amount			$ 291,000	$ 111,000	$ 25,000
Common stock, dividends, per share, cash paid (in dollars per share)			$ 0.06
Cash dividends			$ 82,600
Subsequent Event
Class of Stock [Line Items]
Common stock, dividends, per share, declared (in dollars per share)	$ 0.06