Selected Quarterly Financial Data (Unaudited) Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The quarterly earnings per share amounts for a year will not add to the earnings per share for that year due to the weighting of shares used in calculating per share data.

	2015 Quarters								2014 Quarters
	4th		3rd		2nd		1st		4th		3rd		2nd		1st
					(In thousands except for share data)
Operating revenues (1)	$	176,902	$	289,713	$	219,508	$	163,746	$	196,563	$	283,645	$	251,801	$	185,516
Operating income	8,312		88,047		41,872		7,960		8,871		81,496		51,131		9,665
Net income	648		56,740		21,072		3,458		4,241		52,476		30,096		4,615
Basic earnings per share:
Net income	0.02		1.40		0.52		0.09		0.10		1.30		0.75		0.11
Diluted earnings per share:
Net income	0.02		1.40		0.52		0.09		0.10		1.30		0.75		0.11
Dividends declared per share of common stock	0.295		0.295		0.295		0.280		0.280		0.280		0.280		0.265

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(1) Operating revenues are seasonal in nature, with the peak sales periods generally occurring during the summer months. Comparisons among quarters of a year may not represent overall trends and changes in operations.