Common Stock and Treasury Stock - Additional Information (Details) - USD ($)	3 Months Ended		184 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Feb. 28, 2018
Equity [Abstract]
Amount approved for repurchase				$ 200,000,000.0
Shares repurchased (in shares)	1,000,000	23,802	46,357,495
Shares repurchased, value	$ 28,881,000	$ 631,000	$ 612,300,000
Maximum remaining amount authorized for purchase	$ 112,100,000		$ 112,100,000