Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Allowance for Doubtful Debts

In order to provide for these collection problems and the general risk associated with the granting of credit terms, the Company recorded the following bad debt provisions (in an Allowance for Doubtful Accounts):

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Bad debt provision	$	51,387	$	6,250	$	4,629

Impaired Notes Receivable

December 31, 2018, 2017 and 2016 are as follows:

	Impaired Notes Receivable
Year Ended December 31,	Balance Beginning of Year		Additions		Deductions		Balance End of Year		Average Outstanding Balance
	(in thousands)
2018	$	6,854	$	23,382	$	4,532	$	25,704	$	15,448
2017	$	5,685	$	1,169	$	—	$	6,854	$	6,270
2016	$	6,471	$	—	$	786	$	5,685	$	6,078

	Reserve for Impaired Notes Receivable
Year Ended December 31,	Balance Beginning of Year		Additions		Deductions		Balance End of Year
	(in thousands)
2018	$	2,884	$	12,526	$	1,938	$	13,472
2017	$	2,419	$	465	$	—	$	2,884
2016	$	2,139	$	280	$	—	$	2,419