Schedule II - Valuation and qualifying accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and qualifying accounts

(2) Financial Statement Schedule.

—Schedule II - Valuation and qualifying accounts

Years Ended December 31, 2017, 2016 and 2015

(In thousands)

Description	Balance at Beginning of Year		Additions Charged to Costs and Expenses (a)		Deduction (b)	Balance at End of Year
ALLOWANCE FOR UNCOLLECTIBLE ACCOUNTS:
2015	(893	)	(607	)	203	(1,297	)
2016	(1,297	)	(612	)	322	(1,587	)
2017	(1,587	)	(1,012	)	830	(1,769	)

(a) We record a bad debt provision based upon historical experience and a review of individual customer balances.

(b) When an individual customer balance becomes impaired and is deemed uncollectible, a deduction is made against the allowance for uncollectible accounts.

Years Ended December 31, 2017, 2016 and 2015

(In thousands)

Description	Balance at Beginning of Year		Additions Charged to Costs and Expenses (c)		Deduction	Balance at End of Year
TAX VALUATION ALLOWANCE:
2015	(1,603	)	(378	)	—	(1,981	)
2016	(1,981	)	(1,805	)	—	(3,786	)
2017	(3,786	)	(636	)	—	(4,422	)

(c) We record a valuation allowance against a deferred tax asset when it is determined that it is more likely than not that the deferred tax asset will not be realized.