Unisource Energy Earnings Per Share (EPS) (Tables)

6 Months Ended

Jun. 30, 2011

Unisource Energy Earnings Per Share EPS (Tables) [Abstract]

Effects of dilutive Common Stock on weighted-average number of shares

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
	-Thousands of Dollars-
Numerator:
Net Income	$	28,574	$	25,886	$	41,990	$	46,032
Income from Assumed Conversion of Convertible Senior Notes		1,097		1,097		2,195		2,195
Adjusted Numerator	$	29,671	$	26,983	$	44,185	$	48,227
	-Thousands of Shares-
Denominator:
Weighted Average Shares of Common Stock Outstanding:
Common Shares Issued		36,757		36,106		36,676		36,006
Fully Vested Deferred Stock Units		127		121		122		114
Participating Securities		66		95		71		95
Total Weighted Average Shares of Common Stock Outstanding and Participating Securities — Basic		36,950		36,322		36,869		36,215
Effect of Dilutive Securities:
Convertible Senior Notes		4,267		4,166		4,254		4,153
Options and Stock Issuable under Share Based Compensation Plans		338		412		354		446
Total Shares — Diluted		41,555		40,900		41,477		40,814

Number of stock options to purchase shares of Common Stock excluded from the computation of diluted EPS

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
	-Thousands of Shares-
Stock Options Excluded from the Diluted EPS Computation		158		229		163		232