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Consolidated Statements of Common Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock	Capital in excess of Par	Retained earnings	Total
Balance at Dec. 31, 2011	$ 41,978	$ 618,304	$ 33,707	$ 693,989us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity
Net income			55,681	55,681
Stock/stock units issued through:
Stock purchase and reinvestment plans	506	9,895		10,401
Dividends declared			(42,273)	(42,273)us-gaap_DividendsCommonStock
Balance at Dec. 31, 2012	42,484	628,199	47,115	717,798us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity
Net income			63,445	63,445
Stock/stock units issued through:
Stock purchase and reinvestment plans	560	11,326		11,886
Dividends declared			(43,006)	(43,006)us-gaap_DividendsCommonStock
Balance at Dec. 31, 2013	43,044	639,525	67,554	750,123us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity
Net income			67,103	67,103
Stock/stock units issued through:
Stock purchase and reinvestment plans	435	10,018		10,453
Dividends declared			(44,381)	(44,381)us-gaap_DividendsCommonStock
Balance at Dec. 31, 2014	$ 43,479	$ 649,543	$ 90,276	$ 783,298us-gaap_StockholdersEquity

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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