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Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan (Tables) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The table below presents the average fair value per share, shares purchased, and the compensation expense that resulted from the two ESPP offering periods that took place in the years ended December 31, as indicated (expense in thousands):
Year Ended December 31, |  |  | Average fair value per share |  |  | Shares |  | Expense |
2014 |  |  | $8.35 |  |  | 207,805 |  | $ | 1,756 |  |
2013 |  |  | $7.16 |  |  | 203,200 |  | $ | 1,195 |  |
2012 |  |  | $3.53 |  |  | 154,934 |  | $ | 755 |  |
Schedule of Other Share-based Compensation, Activity [Table Text Block] | The following table summarizes the balance of liability awards and changes during the years ended December 31 2014, 2013 and 2012 (in thousands):
|  | 2014 |  | 2013 |  | 2012 |
Balances of liability awards at beginning of year |  | $ | 2,500 |  |  | $ | 2,000 |  |  | $ | 1,852 |  |
Granted |  | 500 |  |  | 1,000 |  |  | 1,694 |  |
Settled |  | (1,497 | ) |  | (500 | ) |  | (1,546 | ) |
Canceled |  | (50 | ) |  | — |  |  | — |  |
Balance of liability awards end of year |  | $ | 1,453 |  |  | $ | 2,500 |  |  | $ | 2,000 |  |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following table displays the weighted average assumptions that have been applied to estimate the fair value of stock option awards on the date of grant. During 2014 and 2013, the Company did not grant any stock option awards.
|  | Year Ended December 31,
|  |  | 2012
Dividend yield |  |  | — |
Risk-free interest rate |  |  | 1.19 | %
Expected volatility |  |  | 64.15 | %
Expected lives |  |  | 7.3 years |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following summarizes pricing and term information for options outstanding as of December 31, 2014:
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  | Number Outstanding at |  | Weighted Average Remaining Contractual Life (years) |  | Weighted Average Exercise Price |  | Number Exercisable at |  | Weighted Average Exercise Price
Range of Exercise Prices |  | December 31, 2014 |  |  |  | December 31, 2014 |
$ | 4.44 |  |  | - |  | $ | 8.26 |  |  | 141,321 |  |  | 4.2 |  |  | $ | 7.04 |  |  |  | 137,347 |  |  |  | $ | 7.01 |  |
9.19 |  |  | - |  | 11.39 |  |  | 231,836 |  |  | 3.2 |  |  | 11.00 |  |  |  | 198,891 |  |  |  | 11.09 |  |
11.75 |  |  | - |  | 12.90 |  |  | 211,724 |  |  | 2.1 |  |  | 12.40 |  |  |  | 211,724 |  |  |  | 12.40 |  |
13.31 |  |  | - |  | 13.58 |  |  | 35,000 |  |  | 2.0 |  |  | 13.32 |  |  |  | 34,531 |  |  |  | 13.32 |  |
16.51 |  |  | - |  | 16.51 |  |  | 75,000 |  |  | 7.7 |  |  | 16.51 |  |  |  | 42,187 |  |  |  | 16.51 |  |
$ | 4.44 |  |  | - |  | $ | 16.51 |  |  | 694,881 |  |  | 3.5 |  |  | $ | 11.33 |  |  |  | 624,680 |  |  |  | $ | 11.13 |  |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table is a summary of stock option activity during 2014.
|  | Incentive Stock Options |  | Non- Qualified Stock Options |  | Total |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2013 |  | 69,416 |  | 790,529 |  | 859,945 |  | $ | 10.61 |  |  |  | 4.8 |  |  | $ | 20,903,000 |
Exercised |  | (61,749) |  | (85,414) |  | (147,163) |  | $ | 7.51 |  |  |  |  |  |  |  |
Canceled |  | (3,400) |  | (14,501) |  | (17,901) |  | $ | 8.25 |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  | 4,267 |  | 690,614 |  | 694,881 |  | $ | 11.33 |  |  |  | 3.5 |  |  | $ | 15,189,000 |
Vested and Expected to Vest at December 31, 2014 |  | 4,267 |  | 686,970 |  | 691,237 |  | $ | 11.32 |  |  |  | 3.5 |  |  | $ | 15,120,000 |
Exercisable at December 31, 2014 |  | 4,267 |  | 620,413 |  | 624,680 |  | $ | 11.13 |  |  |  | 3.2 |  |  | $ | 13,782,000 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary of the status of the Company’s unvested RSUs as of December 31, 2014 and changes during the year then ended are presented below:
|  | Service Conditions |  | Performance and Service Conditions |  | Total |  | Weighted Average Grant-Date Fair Value Per Unit
Unvested RSUs outstanding at December 31, 2013 |  | 972,364 |  |  | 394,874 |  |  | 1,367,238 |  |  |  | $ | 18.90 |  |
Granted |  | 216,290 |  |  | 234,846 |  |  | 451,136 |  |  |  | 33.66 |  |
Market value share count adjustment for liability awards |  | — |  |  | (12,826 | ) |  | (12,826 | ) |  |  | 33.19 |  |
Vested |  | (436,251 | ) |  | (230,837 | ) |  | (667,088 | ) |  |  | 18.44 |  |
Forfeited |  | (47,030 | ) |  | (4,869 | ) |  | (51,899 | ) |  |  | 24.42 |  |
Unvested RSUs outstanding at December 31, 2014 |  | 705,373 |  |  | 381,188 |  |  | 1,086,561 |  |  |  | $ | 24.88 |  |
Unvested and expected to vest RSUs outstanding at December 31, 2014 |  | 609,656 |  |  | 355,782 |  |  | 965,438 |  |  |  | $ | 25.21 |  |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + 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 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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