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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 52,860 |  | $ 52,093 | $ 49,707 |  | $ 54,075 |  | $ 57,315 |  | $ 48,144 | $ 48,586 | $ 50,569 | $ 213,957 | $ 199,392 | $ 183,514
Gross profit | 14,436 |  | 16,485 | 14,111 |  | 16,922 |  | 18,912 |  | 13,348 | 13,905 | 16,404 | 64,381 | 60,142 | 50,937
Net income from continuing operations | 4,260 |  | 4,041 | 1,914 |  | 3,602 |  | 5,409 |  | 192 | 2,445 | 3,890 | 15,185 | 10,568 | 6,210
Net income (loss) from discontinued operations | (260) |  | (367) | 3,980 |  | 542 |  | (151) |  | 415 | 219 | 568 | 4,111 | 835 | 768
Preferred stock dividend | 0 |  | (4) | 0 |  | 0 |  | (4) |  | (3) | (4) | (3) | (4) | (14) | (14)
Net income available to common shareholders | $ 4,000 |  | $ 3,670 | $ 5,894 |  | $ 4,144 |  | $ 5,254 |  | $ 604 | $ 2,660 | $ 4,455 | $ 19,292 | $ 11,389 | $ 6,964
Basic earnings per common share: | $ 0.22 |  | $ 0.21 | $ 0.32 |  | $ 0.23 |  | $ 0.29 |  | $ 0.03 | $ 0.15 | $ 0.24 | $ 1.06 | $ 0.63 | $ 0.38
Diluted earnings per common share: (a) | $ 0.22 | [1] | $ 0.21 | $ 0.32 | [1] | $ 0.23 | [1] | $ 0.25 | [1] | $ 0.03 | $ 0.15 | $ 0.24 | $ 1.00 | $ 0.63 | $ 0.38
[1] | Earnings per share are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts does not equal the total computed for the year 2013 due to the application of the if-converted method on our convertible subordinated debentures (TIDES) and rounding.

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