Supplemental Consolidated Cash and Cash Flow Information - Summary of Cash and Restricted Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash	$ 21,774	$ 25,206	$ 11,906
Restricted cash	549	302	0
Total cash and restricted cash shown in the Consolidated Statements of Cash Flows	22,323	25,508	11,906	$ 7,627
Interest	15,476	14,104	12,532
Income taxes	$ 17,301	$ 22,946	$ 8,679