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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 303,833 |  | $ 298,549 |  | $ 273,604 |  | $ 273,904 |  | $ 277,039 |  | $ 272,681 |  | $ 267,108 |  | $ 260,607 |  |  |  |
Operating costs and expenses | 298,616 |  | 278,540 |  | 253,965 |  | 255,981 |  | 257,814 |  | 255,070 |  | 248,730 |  | 248,477 |  |  |  |
Income before income taxes | 6,481 |  | 21,193 |  | 19,858 |  | 18,957 |  | 19,625 |  | 18,573 |  | 18,283 |  | 13,783 |  | 66,489 | 70,264 | 57,812
Net income | $ 5,452 |  | $ 13,790 |  | $ 12,933 |  | $ 14,954 |  | $ 12,798 |  | $ 11,517 |  | $ 11,320 |  | $ 8,579 |  | $ 47,129 | $ 44,214 | $ 38,156
Basic earnings per common share (in dollars per share) | $ 0.08 | [1] | $ 0.20 | [1] | $ 0.19 | [1] | $ 0.22 | [1] | $ 0.19 | [1] | $ 0.17 | [1] | $ 0.17 | [1] | $ 0.13 | [1] | $ 0.68 | $ 0.65 | $ 0.57
Diluted earnings per common share (in dollars per share) | $ 0.08 | [1] | $ 0.20 | [1] | $ 0.19 | [1] | $ 0.22 | [1] | $ 0.19 | [1] | $ 0.17 | [1] | $ 0.17 | [1] | $ 0.13 | [1] | $ 0.67 | $ 0.65 | $ 0.56
Cash dividends per common share (in dollars per share) | $ 0.17 | [1] | $ 0.16875 | [1] | $ 0.1675 | [1] | $ 0.16625 | [1] | $ 0.165 | [1] | $ 0.16375 | [1] | $ 0.1625 | [1] | $ 0.16125 | [1] |  |  |
[1] | Year-to-date earnings and cash dividends per common share amounts may differ from the sum of quarterly amounts due to rounding.

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