Equity Transactions (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended			12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Jul. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Preferred stock, shares authorized		10,000		10,000	10,000
Increase in stock repurchase plan authorized	$ 100,000	$ 100,000	$ 50,000
Authorized amount for repurchase of common stock	500,000
Expiration date on repurchase authorizations				Dec. 31, 2021
Common stock acquired, shares				1,602
Common stock acquired, cost				$ 129,045	$ 35,786	$ 9,606
Remaining authorized repurchase amount	$ 248,271	$ 148,271		$ 148,271