Consolidated Statements of Comprehensive Income (Parentheticals) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amortization of prior service credit included in net periodic cost, tax effect	$ (871)	$ (899)	$ (1,741)	$ (1,712)
Amortization of actuarial loss included in net periodic cost, tax effect	$ 2,267	$ 1,777	$ 4,513	$ 3,604