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Acquisitions - Pro Forma Consolidated Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 120,016 | $ 115,210 | $ 109,875 | $ 103,948 | $ 102,231 | $ 95,907 | $ 100,532 | $ 95,618 | $ 449,049 | $ 394,288 | $ 359,449
Sales, Pro Forma |  |  |  |  |  |  |  |  | 454,333 | 438,981 | 396,767
Net income |  |  |  |  |  |  |  |  | 16,570 | 19,710 | 23,044
Net income, Pro Forma |  |  |  |  |  |  |  |  | $ 17,112 | $ 25,075 | $ 22,033
EARNINGS PER COMMON SHARE: |  |  |  |  |  |  |  |  |  |  |
Earnings per common share: basic (in dollars per share) | $ 0.15 | $ 0.13 | $ 0.09 | $ 0.02 | $ 0.02 | $ 0.17 | $ 0.14 | $ 0.14 | $ 0.39 | $ 0.47 | $ 0.59
Earnings per common share: basic, Pro Forma (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.40 | $ 0 | $ 0.56
Earnings per common share: diluted (in dollars per share) | $ 0.15 | $ 0.13 | $ 0.09 | $ 0.02 | $ 0.01 | $ 0.17 | $ 0.14 | $ 0.14 | $ 0.39 | $ 0.46 | $ 0.58
Earnings per common share: diluted, Pro Forma (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.40 | $ 0 | $ 0.55

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