Summary of Significant Accounting Policies - Schedule of Allowances Against Accounts and Notes Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Balance at beginning of period	$ 7,223	$ 6,458	$ 5,406
Additions and charges to cost and expense for allowances for doubtful accounts	2,257	1,109	1,195
Deductions/ write-offs	(1,500)	(344)	(143)
Balance at end of period	$ 7,980	$ 7,223	$ 6,458