Leasing Arrangements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Leased Assets [Line Items]
Rental expense	$ 6,500	$ 6,500	$ 5,900
Total lease cost	6,539
Reasonably assured renewal option	11,400
Selling, General and Administrative Expenses
Operating Leased Assets [Line Items]
Total lease cost	3,500
Cost of Sales
Operating Leased Assets [Line Items]
Total lease cost	1,500
Research and Development Expense
Operating Leased Assets [Line Items]
Total lease cost	$ 1,500