Accumulated Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2012

Accumulated Comprehensive Income [Abstract]

Accumulated other comprehensive income (loss)

Accumulated other comprehensive income (loss) in the consolidated balance sheet consists of the following (in thousands of dollars):

			Defined			Defined			Accumulated
	Foreign		Benefit			Benefit			Other
	Currency		Pension			Postretirement			Comprehensive
	Translation		Plans			Plans			Loss
Balance, Dec. 31, 2011	$	1,761	$	(81,813	)	$	1,116		$	(78,936	)
Current-period change		14,034		(2,116	)		(68	)		11,850
Balance, September 30, 2012	$	15,795	$	(83,929	)	$	1,048		$	(67,086	)