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Common Stock and Treasury Stock (Details) - USD ($)	3 Months Ended	6 Months Ended		40 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Feb. 28, 2018
Equity [Abstract]
Amount approved for repurchase					$ 200,000,000.0
Shares repurchased (in shares)	1,000,000	1,000,000	1,000,000	47,357,495
Shares repurchased, value	$ 39,411,000	$ 39,411,000	$ 28,881,000	$ 651,700,000
Maximum remaining amount authorized for purchase	$ 72,700,000	$ 72,700,000		$ 72,700,000

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