Accounts Receivable - Accounts Receivable Balance (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Accounts receivable	$ 358,249	$ 350,369
Less: Accounts receivable allowance	(15,072)	(16,511)
Accounts receivable, net	$ 343,177	$ 333,858	$ 343,113	$ 331,295