Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Selected Quarterly Financial Data [Abstract]

Selected Quarterly Financial Data

	Three Months Ended
	March 31		June 30		September 30		December 31
2011
Revenues	$	208,390,000	$	211,507,000	$	218,929,000	$	250,239,000
Operating costs and expenses	$	196,765,000	$	197,253,000	$	202,385,000	$	235,861,000
Income before income taxes	$	12,339,000	$	14,717,000	$	15,189,000	$	15,567,000
Net income	$	7,767,000	$	9,828,000	$	9,996,000	$	10,565,000
Basic earnings per common share(1)	$	0.12	$	0.15	$	0.15	$	0.16
Diluted earnings per common share(1)	$	0.12	$	0.15	$	0.15	$	0.16
Cash dividends per common share(1)	$	0.16	$	0.16	$	0.16	$	0.16
2010
Revenues	$	183,801,000	$	192,954,000	$	195,114,000	$	202,087,000
Operating costs and expenses	$	172,474,000	$	178,390,000	$	182,872,000	$	188,723,000
Income before income taxes	$	12,077,000	$	14,181,000	$	13,424,000	$	14,437,000
Net income	$	7,428,000	$	8,721,000	$	9,169,000	$	9,123,000
Basic earnings per common share(1)	$	0.11	$	0.13	$	0.14	$	0.14
Diluted earnings per common share(1)	$	0.11	$	0.13	$	0.14	$	0.14
Cash dividends per common share(1)	$	0.14	$	0.15	$	0.15	$	0.16

⁽¹⁾ Year-to-date earnings and cash dividends per common share amounts may differ from the sum of quarterly amounts due to rounding.