Stock Repurchase (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Oct. 30, 2017
Stock Repurchase [Abstract]
Stock repurchase program, additional authorized amount				$ 750,000,000
Shares repurchased during period (in shares)		0	12,929,487
Shares repurchased, average price (in usd per share)			$ 8.91
Total value of shares repurchased	$ 7,697,000		$ 115,477,000

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration