Summary of Significant Accounting Policies - Cumulative Effect of the Changes Made to Consolidated Balance Sheet for the Adoption of New Guidance (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net		$ 215,755	$ 216,714
Deferred tax assets	$ 1,706	3,659	3,600
Deferred tax liabilities	13,368	34,082	34,247
Retained earnings	$ 50,937	133,384	$ 134,119
Impact of Adoption of New Credit Losses Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net		(959)
Deferred tax assets		59
Deferred tax liabilities		(165)
Retained earnings		$ (735)