Summary of Significant Accounting Policies - Schedule of Allowances Against Accounts and Notes Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Balance at beginning of period	$ 4,483	$ 4,495	$ 4,122
Additions/ charges to cost and expense for allowances for doubtful accounts	1,195	433	630
Adjustments (to)/from deferred revenue, net, for accounts where collectability is remote	130	(80)	228
Deductions/ write-offs	(273)	(365)	(485)
Balance at end of period	$ 5,535	$ 4,483	$ 4,495