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Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | [1] | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net Income per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 544 | $ 5,144 | $ 6,853 | $ 7,591 | $ 9,393 | $ (5,768) | $ 3,068 | $ 3,526 | $ 20,132 | [2] | $ 10,219 | [2] | $ 22,423 | [2]
Less: earnings allocated to RSUs |  |  |  |  |  |  |  |  | (450) |  | (375) |  |  |
Net income (loss) available to common shareholders |  |  |  |  |  |  |  |  | $ 19,682 |  | $ 9,844 |  |  |
Weighted average number of common shares outstanding |  |  |  |  |  |  |  |  | 29,031 |  | 28,776 |  | 28,595 |
Basic and diluted |  |  |  |  |  |  |  |  | $ 0.68 |  | $ 0.34 |  | $ 0.78 |
[1] | Includes $8.9 million related to Vectren deal costs.
[2] | *There is no material difference between net income and comprehensive income.

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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