CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME (LOSS)	$ 4,878	$ 11,841	$ (8,517)	$ (6,321)
OTHER COMPREHENSIVE INCOME, net of tax
Unrecognized net actuarial gain and curtailment, net of tax of: (2013 - Three-month period $18,001, Six-month period $18,001)	28,274		28,274
Amortization of unrecognized net periodic benefit costs, net of tax of: (2013 - Three-month period $1,115, Six-month period $2,229; 2012 - Three-month period $1,089, Six-month period $2,178)
Net actuarial loss	1,779	1,739	3,558	3,478
Prior service credit	(29)	(29)	(58)	(58)
Change in foreign currency translation, net of tax of: (2013 - Three-month period $76, Six-month period $87; 2012 - Three-month period $17, Six-month period $9)	(116)	(27)	(135)	(14)
OTHER COMPREHENSIVE INCOME, net of tax	29,908	1,683	31,639	3,406
TOTAL COMPREHENSIVE INCOME (LOSS)	$ 34,786	$ 13,524	$ 23,122	$ (2,915)