Valuation and Qualifying Accounts and Reserves (Schedule II)

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts and Reserves (Schedule II)

Valuation and Qualifying Accounts and Reserves

(Schedule II)

Changes in the allowance for doubtful accounts were as follows:

(thousands of dollars)	2018			2017			2016
Beginning balance	$	52,997		$	40,450		$	49,420
Bad debt expense	38,240			42,716			29,869
Uncollectible accounts written off, net of recoveries	(45,354		)	(30,169		)	(38,839		)
Ending balance	$	45,883		$	52,997		$	40,450

Changes in deferred tax asset valuation allowances were as follows:

(thousands of dollars)	2018		2017			2016
Beginning balance	$	44,101	$	17,292		$	12,595
Additions (deductions) (1)	10,660		(489		)	4,697
Acquired balances	18,782		27,298			—
Ending balance	$	73,543	$	44,101		$	17,292

⁽¹⁾ Additions (deductions) did not have a material impact on the Income Statement in 2018, 2017 or 2016.