Consolidated Statement of Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 243,194	$ 216,612	$ 184,644
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(1,407)	(8,956)	5,591
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	(87)	(87)	(87)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	159	159	159
Defined Benefit Plan, Amortization of Gains (Losses)	468	0	326
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	71	2,210	(1,521)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	242,981	209,938	189,112
Net Income (Loss) Attributable to Noncontrolling Interest	383	541	(40)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 242,598	$ 209,397	$ 189,152