Stockholders' Equity - Common Stock Repurchases (Details) - $ / shares	3 Months Ended	12 Months Ended
Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020
Equity [Abstract]
Shares repurchased (in shares)	3,998,037	5,038,619	5,495,976	300,000	14,832,632
Share repurchase, average price per share (in dollars per share)	$ 9.03	$ 9.01	$ 7.96	$ 8.11	$ 8.61

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration