Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2018

Valuation And Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

11.    Valuation and Qualifying Accounts

For the Years Ended December 31, 2018, 2017 and 2016

(in thousands)

			Additions
	Balance, beginning of period		Charged to costs and expenses		Charged to other accounts		Deductions(1)			Balance, end of period
Year ended December 31, 2018:
Deducted from asset account – Allowance for uncollectible accounts	$	3,991	$	1,978	$	—	$	(1,941	)	$	4,028
Year ended December 31, 2017:
Deducted from asset account – Allowance for uncollectible accounts		3,222		2,634		—		(1,865	)		3,991
Year ended December 31, 2016:
Deducted from asset account – Allowance for uncollectible accounts		3,451		1,475		—		(1,704	)		3,222

(1) Primarily uncollectible accounts written off — net of recoveries.