Accounting Standards Adopted and Newly Issued Accounting Standards Not Yet Adopted - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses		$ 22,100		$ 22,100		$ 11,300
(Accumulated deficit) retained earnings		(53,992)		(53,992)		$ 61,653
Income tax provision		$ (865)	$ 7,815	$ (6,119)	$ 24,981
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member					us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	$ 700					$ 700
(Accumulated deficit) retained earnings	(500)
Income tax provision	$ (200)