Selected Quarterly Financial Data

12 Months Ended

Dec. 31, 2019

Selected Quarterly Financial Data [Abstract]

Selected Quarterly Financial Data

		First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year
2019
Operating revenues	$	201,132	$	218,892	$	243,626	$	226,042	$	889,692
Operations and maintenance expense		79,314		86,445		82,022		85,321		333,102
Operating income		67,439		80,949		106,470		85,301		340,159
Net income		16,924		54,903		88,489		64,227		224,543
Basic net income per common share		0.09		0.25		0.38		0.28		1.04
Diluted net income per common share		0.09		0.25		0.38		0.28		1.04
Dividend paid per common share		0.2190		0.2190		0.2343		0.2343		0.9066
Dividend declared per common share		0.2190		0.2190		0.2343		0.2343		0.9066
2018
Operating revenues	$	194,347	$	211,860	$	226,137	$	205,747	$	838,091
Operations and maintenance expense		73,946		73,515		68,624		92,393		308,478
Operating income		69,337		86,754		104,293		62,794		323,178
Net income (loss)		50,839		66,590		78,216		(3,657)		191,988
Basic net income (loss) per common share		0.29		0.37		0.44		(0.02)		1.08
Diluted net income (loss) per common share		0.29		0.37		0.44		(0.02)		1.08
Dividend paid per common share		0.2047		0.2047		0.2190		0.2190		0.8474
Dividend declared per common share		0.2047		0.2047		0.2190		0.2190		0.8474