Accounts Receivable, Net - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
Balance at the beginning	$ 2,272	$ 14,065	$ 15,521
Cumulative Effect of ASC 606		(9,894)
Additions	1,877	630	9,423
Reductions	(762)	(1,155)	(10,879)
Recoveries	(746)	(1,374)
Balance at the end	$ 2,641	$ 2,272	$ 14,065