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Capital Transactions (Details 3) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 19, 2014 | Sep. 19, 2013 | Aug. 29, 2013 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Stock options |  |  |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |  |  |
Outstanding options to purchase (in shares) |  |  |  | 1,791,000 |  | 1,791,000 |  | 2,037,000
Exercisable (in shares) |  |  |  | 993,000 |  | 993,000 |  | 1,069,000
Expected to vest (in shares) |  |  |  | 655,000 |  | 655,000 |  | 794,000
Aggregate Intrinsic value, outstanding |  |  |  | $ 3,238 |  | $ 3,238 |  | $ 6,801
Aggregate Intrinsic value, exercisable |  |  |  | 2,669 |  | 2,669 |  | 4,928
Aggregate Intrinsic value, expected to vest |  |  |  | 541 |  | $ 541 |  | 1,779
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Special one-time cash dividend paid per common share (in dollars per share) |  | $ 1.50 | $ 1.50 |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  |  |  |  | 1.50% |  |
Dividend yield (as a percent) |  |  |  |  |  | 2.80% |  |
Stock options | Minimum |  |  |  |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |  |  |
Expected life |  |  |  |  |  | 5 years |  |
Expected volatility (as a percent) |  |  |  |  |  | 46.30% |  |
Stock options | Maximum |  |  |  |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |  |  |
Expected life |  |  |  |  |  | 6 years |  |
Expected volatility (as a percent) |  |  |  |  |  | 52.30% |  |
RSUs |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 583 | $ 269 | $ 1,339 | $ 466 |
Related tax benefits |  |  |  | 230 | $ 106 | 529 | $ 184 |
Unrecognized share-based compensation expense |  |  |  | 3,109 |  | $ 3,109 |  | $ 849
Weighted-average period over which the remaining compensation expense is expected to be recognized |  |  |  |  |  | 1 year 10 months 24 days |  |
Minimum statutory withholding requirement paid on behalf of employees (in shares) |  |  |  |  |  | 8 |  |
Performance-based RSUs |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Vesting period based on achieving operating income and earnings per share targets |  |  |  |  |  | 1 year |  |
Performance-based RSUs | Maximum |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Potential compensation expense |  |  |  | $ 3,600 |  | $ 3,600 |  |
SARs |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Special one-time cash dividend paid per common share (in dollars per share) | $ 1.50 |  | $ 1.50 |  |  |  |  |
2012 Stock Incentive Plan | RSUs |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Units outstanding at the beginning of the period (in shares) |  |  |  |  |  | 180,000 |  |
Granted (in shares) |  |  |  |  |  | 593,000 |  |
Issued (in shares) |  |  |  |  |  | (30,000) |  |
Forfeited or canceled (in shares) |  |  |  |  |  | (75,000) |  |
Units outstanding at the end of the period (in shares) |  |  |  | 668,000 |  | 668,000 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Units outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  | $ 15.09 |  |
Granted (in dollars per share) |  |  |  |  |  | 12.76 |  |
Issued (in dollars per share) |  |  |  |  |  | 13.63 |  |
Forfeited or canceled (in dollars per share) |  |  |  |  |  | 12.89 |  |
Units outstanding at the end of the period (in dollars per share) |  |  |  | $ 12.59 |  | $ 12.59 |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Discount for lack of marketability ( as a percent) |  |  |  |  |  | 17.50% |  |
2012 Stock Incentive Plan | RSUs | Minimum |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 12 months |  |
Vesting period based on achieving operating income and earnings per share targets |  |  |  |  |  | 3 years |  |
2012 Stock Incentive Plan | RSUs | Maximum |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 48 months |  |
Vesting period based on achieving operating income and earnings per share targets |  |  |  |  |  | 6 years |  |
2012 Stock Incentive Plan | RSUs | Board of Directors |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Number of shares subject to restriction period |  |  |  | 43,000 |  | 43,000 |  | 32,000
Restriction period |  |  |  |  |  | 2 years |  |
2012 Stock Incentive Plan | Performance-based RSUs |  |  |  |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  |  |  |  | $ 12.13 |  |
2012 Stock Incentive Plan | Time-based RSUs |  |  |  |  |  |  |  |
Weighted-average assumptions used to calculate fair value of options granted |  |  |  |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  |  |  |  | $ 13.28 |  |
2012 Stock Incentive Plan | SARs |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Units outstanding at the beginning of the period (in shares) |  |  |  |  |  | 30,000 |  |
Forfeited or canceled (in shares) |  |  |  |  |  | (10,000) |  |
Units outstanding at the end of the period (in shares) |  |  |  | 20,000 |  | 20,000 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Units outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  | $ 5.47 |  |
Forfeited or canceled (in dollars per share) |  |  |  |  |  | 5.86 |  |
Units outstanding at the end of the period (in dollars per share) |  |  |  | $ 5.27 |  | $ 5.27 |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Number of shares of common stock used for determining the fair value, or strike price, of grants |  |  |  | 1 |  | 1 |  |
Share-based compensation expense |  |  |  | $ 3 |  | $ 6 |  |
Related tax benefits |  |  |  | 2 |  | 3 |  |
Unrecognized share-based compensation expense |  |  |  | $ 67 |  | $ 67 |  | $ 150
Weighted-average period over which the remaining compensation expense is expected to be recognized |  |  |  |  |  | 2 years 1 month 6 days |  |
2012 Stock Incentive Plan | SARs | Minimum |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 12 months |  |
2012 Stock Incentive Plan | SARs | Maximum |  |  |  |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 48 months |  |

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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 The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or 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)(i)-(ii) -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 vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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