Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2016

Valuation And Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

12.    Valuation and Qualifying Accounts

For the Years Ended December 31, 2016, 2015 and 2014

(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, 2016:
Deducted from asset account – Allowance for uncollectible accounts	$	3,451	$	1,475		—	$	(1,704	)	$	3,222
Year ended December 31, 2015:
Deducted from asset account – Allowance for uncollectible accounts		3,868		1,463		—		(1,880	)		3,451
Year ended December 31, 2014:
Deducted from asset account – Allowance for uncollectible accounts		3,737		1,942		—		(1,811	)		3,868

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