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Share-based Compensation (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Summary of Non Vested Stock Option Activity | The following table summarizes the nonvested stock options activity for the six months ended June 30, 2013:
Nonvested stock options |  | Shares |  |  | Weighted-average exercise prices |
Nonvested at December 31, 2012 |  |  | 4,571,258 |  |  | $ | 2.16 |
Vested |  |  | (3,436,392 | ) |  |  | 2.11 |
Nonvested at June 30, 2013 |  |  | 1,134,866 |  |  | $ | 2.30 |
| The following table summarizes the nonvested stock options activity for the years ended December 31, 2012 and 2011:
Nonvested stock options |  | Shares |  |  | Weighted-average exercise prices(2) |
Nonvested at December 31, 2010 |  |  | — |  |  | $ | — |
Granted(1) |  |  | 5,739,140 |  |  |  | 1.30 |
Vested(3)(4) |  |  | (326,574 | ) |  |  | 1.30 |
Forfeitures |  |  | (350,592 | ) |  |  | 1.30 |
Nonvested at December 31, 2011 |  |  | 5,061,974 |  |  | $ | 1.30 |
Granted |  |  | 1,020,000 |  |  |  | 4.95 |
Vested(3)(4) |  |  | (279,750 | ) |  |  | 1.30 |
Forfeitures |  |  | (1,230,966 | ) |  |  | 1.30 |
Nonvested at December 31, 2012 |  |  | 4,571,258 |  |  | $ | 2.16 |
(1) | Includes 100,000 of stock options that were not granted under the Equity Incentive Plan, but are subject to certain terms of the Equity Incentive Plan.
(2) | Exercise price was retroactively adjusted to reflect the equitable adjustment of $3.71 per share as discussed below.
(3) | Amount of options exercisable as of December 31, 2012 and 2011, respectively. The weighted average remaining contractual term of these options is 7.85 years and 8.75 years as of December 31, 2012 and 2011, respectively.
(4) | At December 31, 2012 and 2011, the aggregate intrinsic value amounted to $1.6 million and $1.2 million, respectively.
Nonvested Restricted Shares Activity | The following table summarizes the nonvested restricted shares activity for the six months ended June 30, 2013:
Nonvested restricted shares |  | Shares |  |  | Weighted-average grant date fair value |
Nonvested at December 31, 2012 |  |  | 115,420 |  |  | $ | 5.90 |
Vested |  |  | (115,420 | ) |  |  | 5.90 |
Nonvested at June 30, 2013 |  |  | — |  |  | $ | — |
| The following table summarizes the nonvested restricted shares activity for the years ended December 31, 2012 and 2011:
Nonvested restricted shares |  | Shares |  |  | Weighted-average grant date fair value |
Nonvested at December 31, 2010 |  |  | — |  |  | $ | — |
Granted |  |  | 160,000 |  |  |  | 5.00 |
Vested(1) |  |  | (33,884 | ) |  |  | 5.00 |
Nonvested at December 31, 2011 |  |  | 126,116 |  |  |  | 5.00 |
Granted |  |  | 29,292 |  |  |  | 8.54 |
Vested(1) |  |  | (86,128 | ) |  |  | 5.00 |
Nonvested at December 31, 2012 |  |  | 69,280 |  |  | $ | 6.50 |
(1) | At December 31, 2012 and 2011, the aggregate intrinsic value amounted to $0.2 million and $0.1 million, respectively.
Share-Based Compensation Recognized | Share-based compensation recognized was as follows:
|  | Three months ended June 30, |  |  | Six months ended June 30, |
(Dollar amounts in thousands) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Share-based compensation recognized, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options, net of income tax of $488, $40, $500 and $87 |  | $ | 5,062 |  |  | $ | 134 |  |  | $ | 5,212 |  |  | $ | 291 |
Restricted shares, net of income tax of $11, $49, $26 and $80 |  |  | 90 |  |  |  | 163 |  |  |  | 271 |  |  |  | 266 |
| Share-based compensation recognized was as follows:
|  | Year ended December 31, |
(Dollar amounts in thousands) |  | 2012 |  |  | 2011 |
Share-based compensation recognized, net |  |  |  |  |  |  |  |
Stock options, net of income tax expense of $62 and $214 |  | $ | 595 |  |  | $ | 714 |
Restricted shares, net of income tax expense of $47 and $51 |  |  | 609 |  |  |  | 170 |
Assumptions used to Estimate Fair Value of Stock Option Granted |  | The fair value of the stock options granted during 2011 and 2012 was estimated using the Black-Scholes-Merton (“BSM”) option pricing model for Tranche A options granted under the Equity Incentive Plan and the Monte Carlo simulation analysis for Tranche B and Tranche C options, with the following assumptions:
|  | Years ended December 31, |
|  | 2012 |  |  | 2011 |
|  | Stock options granted under the Stock Incentive Plan |  |  | Stock options granted under the Stock Incentive Plan |  |  | Stock options not granted under the Stock Incentive Plan |
Stock Price(1) |  | $ | 5.19 per share |  |  | $ | 1.30 per share |  |  | $ | 1.30 per share |
Risk-free rate |  |  | 0.59 | % |  |  | 2.14 | % |  |  | 2.06 | %
Expected volatility |  |  | 31.12 | % |  |  | 35.00 | % |  |  | 35.00 | %
Expected annual dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Expected term |  |  | 3.87 years |  |  |  | 4.60 years |  |  |  | 4.49 years |
(1) | As discussed above, on May 9, 2012 an equitable adjustment to stock options was approved with caused a reduction of $3.71 per share of the exercise price of the outstanding options. Accordingly, the stock price presented above reflects this equitable adjustment for both periods as applicable.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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