Comprehensive Income Parenthetical (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cash flow hedge - tax benefit/(provision)	$ 171	$ (337)	$ (10,970)	$ (941)
Pension and other post retirement benefits - tax (provision)/benefit	$ (56)	$ (24)	$ (169)	$ 190