Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts

VALUATION AND QUALIFYING ACCOUNTS

FOR THE YEARS ENDED DECEMBER 31, 2015, 2014 AND 2013

(Thousands of dollars)

			Additions
	Balance at Beginning of Year		Charge to Costs and Expenses			Other Comprehensive Income (Loss)		Deductions From Reserves			Balance at End of Year
2015
Allowance for doubtful accounts receivable	$	514	$	380		$	—	$	(27	)	$	867
Valuation allowances for deferred tax assets	$	3,911	$	1,980							$	5,891
2014
Allowance for doubtful accounts receivable	$	910	$	(426	)	$	—	$	30		$	514
Valuation allowances for deferred tax assets	$	3,398	$	473		$	40	$	—		$	3,911
2013
Allowance for doubtful accounts receivable	$	573	$	838		$	—	$	(501	)	$	910
Valuation allowances for deferred tax assets	$	3,394	$	4		$	—	$	—		$	3,398