CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net unrealized gain (loss) from pension and postretirement plans, tax	$ (421)	$ (596)	$ (534)	$ (409)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	187	(57)
Other Comprehensive Income Reclassification Of Net Unrealized Gain Loss On Interest Rate Swaps During Period Tax	0	464	50	924
Subsidiaries [Member]
Net unrealized gain (loss) from pension and postretirement plans, tax	766	1,011	1,844	2,835
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	386	975
Amortization of Financing Cash Flow Hedge Contracts to Earnings Tax	$ 43	$ 43	$ 85	$ 85