Preferred Stock, Common Stock and Other Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands		12 Months Ended			47 Months Ended
	Mar. 31, 2020 item $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Feb. 19, 2021 USD ($) $ / shares shares	Mar. 30, 2017 USD ($)
Preferred Stock, Common Stock and Other Stockholders' Equity (Deficit)
Common stock, shares authorized (in shares)		280,000,000	280,000,000
Common stock, shares outstanding (in shares)		85,075,901	84,633,845
Value of shares repurchased | $		$ 54	$ 52	$ 110,990
Preferred stock, shares authorized		5,000,000
Preferred stock, shares issued		0
Preferred stock, shares authorized for future issuance		0
Par value | $ / shares		$ 1.00	$ 1.00
March 2017 Stock Repurchase Plan
Preferred Stock, Common Stock and Other Stockholders' Equity (Deficit)
Amount authorized of shares to be repurchased under Stock Repurchase Program | $						$ 500,000
Total number of shares purchased (in shares)					4,607,000
Value of shares repurchased | $					$ 268,300
Shares acquired, average cost (in dollars per share) | $ / shares					$ 58.25
Permitted dollar value of repurchases remaining | $					$ 231,700
Long Term Incentive Plan
Preferred Stock, Common Stock and Other Stockholders' Equity (Deficit)
Shares available for future grant (in shares)		4,375,000
Employee Stock Purchase Plan
Preferred Stock, Common Stock and Other Stockholders' Equity (Deficit)
Shares in ESOP (in shares)		1,579,000
Preferred share purchase right
Preferred Stock, Common Stock and Other Stockholders' Equity (Deficit)
Dividend, Preferred share purchase right | item	1
Exercisable exercise price of the Right | item	2
Share price | $ / shares	$ 75.00
Term of rights plan	1 year
Series B Junior Preferred Stock | Preferred share purchase right
Preferred Stock, Common Stock and Other Stockholders' Equity (Deficit)
Percentage of purchase of a preferred shares represented by rights	0.001
Par value | $ / shares	$ 1.00