Stock-Based Compensation - Expenses Recorded Within Operating Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses	$ 9,438	$ 13,919	$ 8,835
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses	0	777	2,736
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses	1,083	4,566	4,053
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses	3,016	5,052	2,046
Stock compensation plan for Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses	561	563	0
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses	3,435	2,961	0
Sign on RSU incentive
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses	453	0	0
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expenses	$ 891	$ 0	$ 0