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Net (Loss) Income Per Common Share (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012
Earnings Per Share [Abstract] |  |
Schedule of Reconciliation of Numerator and Denominator of Earning Per Common Share | The reconciliation of the numerator and denominator of the (loss) income per common share is as follows:
|  | Three months ended June 30, |  |  | Six months ended June 30, |
(Dollar amounts in thousands, except per share data) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net (loss) income |  | $ | (64,935 | ) |  | $ | (2,033 | ) |  | $ | (59,463 | ) |  | $ | 1,501 |
Weighted average common shares outstanding |  |  | 78,928,780 |  |  |  | 72,672,852 |  |  |  | 75,849,551 |  |  |  | 72,659,463 |
Weighted average potential dilutive common shares (1)(2) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,243,747 |
Weighted average common shares outstanding—assuming dilution |  |  | 78,928,780 |  |  |  | 72,672,852 |  |  |  | 75,849,551 |  |  |  | 76,903,210 |
Net (loss) income per common share—basic |  | $ | (0.82 | ) |  | $ | (0.03 | ) |  | $ | (0.78 | ) |  | $ | 0.02 |
Net (loss) income per common share—diluted |  | $ | (0.82 | ) |  | $ | (0.03 | ) |  | $ | (0.78 | ) |  | $ | 0.02 |
(1) | Potential common shares consist of common stock issuable under the assumed exercise of stock options and restricted stock awards using the treasury stock method.
(2) | For the three months ended June 30, 2013 and 2012, 3,818,726 and 3,950,989, respectively, potential common shares consisting of common stock under the assumed exercise of stock options and restricted stock awards using the treasury stock method were not included in the computation of the diluted net (loss) income per share since their inclusion would have an antidilutive effect. For the six months ended June 30, 2013, 4,227,114 potential common shares consisting of common stock under the assumed exercise of stock options and restricted stock awards using the treasury stock method were not included in the computation of the diluted net (loss) income per share since their inclusion would have an antidilutive effect.
| The reconciliation of the numerator and the denominator of the earnings per common share is as follows:
|  | Years ended December 31, |
(Dollar amounts in thousands, except per share data) |  | 2012 |  |  | 2011 |
Net income |  | $ | 77,366 |  |  | $ | 24,214 |
Weighted average common shares outstanding |  |  | 72,707,542 |  |  |  | 72,543,500 |
Weighted average potential dilutive common shares (1) |  |  | 3,649,966 |  |  |  | 710,298 |
Weighted average common shares outstanding—assuming dilution |  |  | 76,367,508 |  |  |  | 73,253,798 |
Net income per common share—basic |  | $ | 1.06 |  |  | $ | 0.33 |
Net income per common share—diluted |  | $ | 1.01 |  |  | $ | 0.33 |
Pro forma net income per common share—basic (2) |  | $ | 0.98 |  |  |  |  |
Pro forma net income per common share—diluted (2) |  | $ | 0.94 |  |  |  |  |
(1) | Potential common shares consist of common stock issuable under the assumed exercise of stock options and restricted stock awards using the treasury stock method.
(2) | Pro forma net income per common share basic and diluted includes 6,250,000 as incremental shares being offered in the initial public offering. These amounts are unaudited.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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