Consolidated Statements of Comprehensive Income Parenthetical (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrealized gain from interest rate swap (net of tax)	$ 0	$ 1,831	$ 102
Pension and postretirement benefits liability adjustment (net of tax)	$ 11,735	$ 31,454	$ 1,646