Quarterly Financial Data (Unaudited): (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data

Quarter Ended	Operating Revenue		Operating Income		Net Income		Income  Per Basic Share		Income  Per Diluted Share
(In thousands, except per share amounts)
03/31/12	$	29,239	$	7,943	$	5,377	$	2.67	$	2.65
06/30/12		30,689		8,967		6,099		3.03		3.02
09/30/12		30,637		9,677		7,259		3.60		3.59
12/31/12		28,497		7,039		4,894		2.42		2.42
03/31/11	$	30,589	$	10,096	$	6,858	$	3.40	$	3.38
06/30/11		31,139		10,437		7,019		3.48		3.46
09/30/11		30,457		10,004		6,774		3.35		3.33
12/31/11		25,519		7,631		5,388		2.67		2.65