SELECTED QUARTERLY INFORMATION (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2011

SELECTED QUARTERLY INFORMATION (UNAUDITED)

Summary of quarterly results

	Quarters
Quarterly Results for 2011	First		Second		Third		Fourth
Operating revenues	$	150,728	$	129,093	$	164,284	$	132,765
Operating income	$	21,848	$	19,134	$	36,450	$	19,502
Net Income	$	11,922	$	9,175	$	25,184	$	8,690
Basic Earning Per Share	$	0.29	$	0.22	$	0.60	$	0.21
Diluted Earnings Per Share	$	0.29	$	0.22	$	0.60	$	0.21

	Quarters
Quarterly Results for 2010	First		Second		Third		Fourth
Operating revenues	$	139,893	$	114,482	$	154,086	$	132,815
Operating income	$	16,078	$	14,279	$	31,873	$	18,265
Net Income	$	8,586	$	7,369	$	22,981	$	8,460
Basic Earning Per Share	$	0.22	$	0.18	$	0.56	$	0.20
Diluted Earnings Per Share	$	0.22	$	0.18	$	0.55	$	0.20