Related Party Transactions	12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	13. Related Party Transactions The Company has, in the ordinary course of business, entered into arrangements with other companies who have shareholders in common with the Company. Pursuant to these arrangements, related-party affiliates receive payments for providing website visitor referrals and to a lesser extent a small amount of office space. During the years ended December 31, 2018 and 2017, the Company recorded expense of $8.2 million and $9.1 million, respectively, related to these arrangements. During the years ended December 31, 2018 and 2017, the Company paid $8.7 million and $8.6 million, respectively, related to these arrangements. As of December 31, 2018 and 2017, amounts due to related-party affiliates totaled $1.0 million and $1.6 million, respectively, which were included in accounts payable on the balance sheets.

Related Party Transactions

12 Months Ended

Dec. 31, 2018

13. Related Party Transactions

The Company has, in the ordinary course of business, entered into arrangements with other companies who have shareholders in common with the Company. Pursuant to these arrangements, related-party affiliates receive payments for providing website visitor referrals and to a lesser extent a small amount of office space. During the years ended December 31, 2018 and 2017, the Company recorded expense of $8.2 million and $9.1 million, respectively, related to these arrangements. During the years ended December 31, 2018 and 2017, the Company paid $8.7 million and $8.6 million, respectively, related to these arrangements. As of December 31, 2018 and 2017, amounts due to related-party affiliates totaled $1.0 million and $1.6 million, respectively, which were included in accounts payable on the balance sheets.