New Accounting Pronouncements - Effect of Accounting Standards Adoption (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2020	Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts and notes receivable	$ 101,046	$ 83,281
Allowance for credit losses	(5,251)	(6,994)
Accounts and notes receivable, net	95,795	76,287
Deferred tax asset, net	13,159
Retained earnings	$ 125,763	$ 120,116
Accounting standards update	us-gaap:AccountingStandardsUpdate201613Member
ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts and notes receivable	$ 0
Allowance for credit losses	(2,337)
Accounts and notes receivable, net	(2,337)
Deferred tax asset, net	466
Retained earnings	$ (1,871)
Adjusted balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts and notes receivable			$ 101,046
Allowance for credit losses			(7,588)
Accounts and notes receivable, net			93,458
Deferred tax asset, net			13,625
Retained earnings			$ 123,892