Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Unrealized investment gains - taxes	$ (721)	$ 137	$ (760)	$ 176
Realized investment gains - taxes	(6)	(78)	(7)	(83)
Change in unfunded benefit obligation for pension and other postretirement benefit plans - taxes	$ 99	$ 91	$ 198	$ 173