Shareholders' equity	9 Months Ended
	Sep. 30, 2021
Stockholders' Equity Note [Abstract]
Shareholders' equity	In October 2018, our board of directors authorized the repurchase of up to $500,000 of our common stock. This authorization has no expiration date. No shares were repurchased during the first nine months of 2021 and $287,452 remained available for repurchase under the authorization as of September 30, 2021. During the quarter ended June 30, 2021, we issued 294 thousand shares to employees of First American in conjunction with the acquisition (Note 6), resulting in cash proceeds of $13,000 during the quarter.