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Common Stock and Treasury Stock - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended		178 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Feb. 28, 2018
Equity [Abstract]
Amount approved for repurchase					$ 200,000,000.0
Shares repurchased (in shares)	1,204,300	1,228,102	2,346,427	45,357,495
Shares repurchased, value	$ 34,986,000	$ 35,617,000	$ 54,527,000	$ 583,400,000
Maximum remaining amount authorized for purchase	$ 141,000,000.0	$ 141,000,000.0		$ 141,000,000.0

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