Consolidated Statements Of Comprehensive Income (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
Statement of Comprehensive Income [Abstract]
Unrealized investment gains - taxes	$ (233)	$ 68	$ (993)	$ 244
Realized investment gains - taxes	(1)	(11)	(8)	(94)
Change in unfunded benefit obligation for pension and other postretirement benefit plans - taxes	$ 99	$ 90	$ 297	$ 263