Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 5,080	$ 8,449	$ 10,131	$ 16,145
Amortization of prior service credit included in net periodic cost, net of tax of $(899), $(766), $(1,712) and $(1,531)	(1,405)	(1,197)	(2,678)	(2,395)
Amortization of actuarial loss included in net periodic cost, net of tax of $1,777, $1,303, $3,604 and $2,706	2,780	2,040	5,638	4,235
Other comprehensive income, net of tax	1,375	843	2,960	1,840
Comprehensive income	$ 6,455	$ 9,292	$ 13,091	$ 17,985