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Supplementary Financial Data Supplementary Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2014
Supplementary Financial Data [Abstract] |
Supplemental Financial Data [Table Text Block] | The following tables set forth our selected consolidated financial and operating data for the quarterly periods indicated.
| December 31, 2014 | September 30, 2014 | June 30, 2014 | March 31, 2014
(In thousands, except per share amounts) | (Unaudited) | (Unaudited) | (Unaudited) | (Unaudited)
Revenue | $ | 367,964 |  | $ | 330,767 |  | $ | 281,608 |  | $ | 234,841 |
Gross margin | $ | 73,759 |  | $ | 68,509 |  | $ | 59,587 |  | $ | 50,877 |
Net income to common shareholders | $ | 9,767 |  | $ | 12,399 |  | $ | 12,335 |  | $ | 11,413 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic | $ | 0.40 |  | $ | 0.51 |  | $ | 0.50 |  | $ | 0.47 |
Diluted | $ | 0.36 |  | $ | 0.44 |  | $ | 0.44 |  | $ | 0.41 |
Weighted average common shares outstanding: |  |  |  |  |  |  |  |
Basic | 24,489 |  | 24,474 |  | 24,470 |  | 24,417 |
Diluted | 29,944 |  | 29,921 |  | 29,913 |  | 29,870 |
| December 31, 2013 | September 30, 2013 | June 30, 2013 | March 31, 2013
(In thousands, except per share amounts) | (Unaudited) | (Unaudited) | (Unaudited) | (Unaudited)
Revenue | $ | 336,307 |  | $ | 275,195 |  | $ | 234,553 |  | $ | 190,727 |
Gross margin | $ | 67,030 |  | $ | 54,909 |  | $ | 46,216 |  | $ | 38,314 |
Net income to common shareholders | $ | 13,043 |  | $ | 124,092 |  | $ | 6,045 |  | $ | 2,397 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic | $ | 0.54 |  | $ | 5.09 |  | $ | 0.25 |  | $ | 0.11 |
Diluted | $ | 0.48 |  | $ | 4.22 |  | $ | 0.25 |  | $ | 0.11 |
Weighted average common shares outstanding: |  |  |  |  |  |  |  |
Basic | 24,358 |  | 24,358 |  | 24,271 |  | 22,273 |
Diluted | 29,783 |  | 29,745 |  | 24,646 |  | 22,688 |

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