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Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Quarterly Financial Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue | $ 131,210 | $ 132,529 | $ 137,192 | $ 127,692 | $ 129,243 | $ 127,245 | $ 127,411 | $ 115,617 | $ 528,623 | $ 499,516 | $ 459,539
Operating Income (Loss) | 26,865 | 25,132 | 32,687 | 21,873 | 24,524 | 29,061 | 22,033 | 15,831 | 106,557 | 91,449 | 78,964
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | 27,019 | 25,306 | 32,895 | 22,110 | 24,782 | 29,408 | 22,449 | 16,234 | 107,330 | 92,873 | 81,302
Net income | $ 17,122 | $ 15,399 | $ 22,532 | $ 14,879 | $ 15,379 | $ 18,297 | $ 16,653 | $ 11,887 | $ 69,932 | $ 62,216 | $ 56,949
Basic EPS | $ 0.20 | $ 0.17 | $ 0.25 | $ 0.16 | $ 0.17 | $ 0.20 | $ 0.18 | $ 0.13 | $ 0.78 | $ 0.69 | $ 0.62

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