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Capital Transactions (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Employee Stock Option [Member] |  |  |  |  |
Share Based Compensation |  |  |  |  |
Outstanding options to purchase (in shares) | 2,144 |  | 2,144 |  | 1,926
Exercisable (in shares) | 1,096 |  | 1,096 |  | 838
Expected to vest (in shares) | 869 |  | 869 |  | 905
Aggregate Intrinsic value, outstanding | $ 8,975 |  | $ 8,975 |  | $ 9,415
Aggregate Intrinsic value, exercisable | 6,498 |  | 6,498 |  | 6,069
Aggregate Intrinsic value, expected to vest | 2,353 |  | 2,353 |  | 3,179
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Share-based compensation expense | 269 | 52 | 466 | 127 |
Related tax benefits | 106 | 18 | 184 | 44 |
Unrecognized share-based compensation expense | $ 1,533 |  | $ 1,533 |  | $ 62
Weighted-average period over which the remaining compensation expense is expected to be recognized |  |  | 2 years 1 month 6 days |  |
Incentive Plan 2012 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Number of Shares |  |  |  |  |
Units outstanding at the beginning of the period (in shares) |  |  | 32 |  |
Granted (in shares) |  |  | 140 |  |
Units outstanding at the end of the period (in shares) | 169 |  | 169 |  |
Forfeited (in shares) |  |  | (3) |  |
Weighted Average Grant Date Fair Value |  |  |  |  |
Units outstanding at the beginning of the period (in dollars per share) |  |  | $ 12.47 |  |
Granted (in dollars per share) |  |  | $ 13.85 |  |
Units outstanding at the end of the period (in dollars per share) | $ 13.39 |  | $ 13.39 |  |
Forfeited (in dollars per share) |  |  | $ 14.38 |  |
Share-based compensation, additional disclosures |  |  |  |  |
Vesting period |  |  | 4 years |  |
Discount for lack of marketability ( as a percent) |  |  | 17.50% |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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