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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, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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:
|  | Year Ended December 31,
|  | 2012 |  | 2011 |  | 2010
Dividend yield |  | — |  |  | — |  |  | — |
Risk-free interest rate |  | 1.19 | % |  | 0.92 | % |  | 1.47 | %
Expected volatility |  | 64.15 | % |  | 75.67 | % |  | 73.26 | %
Expected lives |  | 7.3 years |  |  | 3.6 years |  |  | 3.6 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, 2012:
|  | 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, 2012 |  |  |  | December 31, 2012 |
$ | 2.82 |  |  | ─ |  | $ | 6.68 |  |  | 275,164 |  |  | 3.4 |  |  | $ | 5.33 |  |  |  | 270,436 |  |  |  | $ | 5.33 |  |
6.86 |  |  | ─ |  | 10.20 |  |  | 280,731 |  |  | 7.5 |  |  | 8.03 |  |  |  | 130,360 |  |  |  | 7.86 |  |
10.46 |  |  | ─ |  | 11.39 |  |  | 308,390 |  |  | 6.5 |  |  | 10.88 |  |  |  | 182,132 |  |  |  | 11.18 |  |
11.56 |  |  | ─ |  | 12.90 |  |  | 275,950 |  |  | 4.1 |  |  | 12.25 |  |  |  | 275,950 |  |  |  | 12.25 |  |
12.91 |  |  | ─ |  | 16.51 |  |  | 146,125 |  |  | 7.0 |  |  | 14.98 |  |  |  | 67,625 |  |  |  | 13.30 |  |
$ | 2.82 |  |  | ─ |  | $ | 16.51 |  |  | 1,286,360 |  |  | 5.6 |  |  | $ | 9.83 |  |  |  | 926,503 |  |  |  | $ | 9.48 |  |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table is a summary of stock option activity under the Plan as of December 31, 2012 and changes for the year then ended:
|  | Incentive Stock Options |  | Non- Qualified Stock Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2012 |  | 221,466 |  |  | 2,041,738 |  | $ | 8.62 |  |  |  | 5.3 |  |  | $ | 6,928,000 |
Granted |  | — |  |  | 78,500 |  | $ | 16.43 |  |  |  |  |  |  |  |
Exercised |  | (87,973) |  |  | (880,233) |  | $ | 7.27 |  |  |  |  |  |  |  |
Canceled |  | (4,070) |  |  | (83,068) |  | $ | 12.78 |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  | 129,423 |  |  | 1,156,937 |  | $ | 9.83 |  |  |  | 5.6 |  |  | $ | 13,442,000 |
Vested and Expected to Vest at December 31, 2012 |  | 129,324 |  |  | 1,091,043 |  | $ | 9.70 |  |  |  | 5.4 |  |  | $ | 12,910,000 |
Exercisable at December 31, 2012 |  | 129,192 |  |  | 797,311 |  | $ | 9.48 |  |  |  | 4.5 |  |  | $ | 10,007,000 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | Restricted Stock Units and Restricted Stock Awards A summary of the status of the Company’s unvested RSUs and RSAs as of December 31, 2012 and changes during the year then ended are presented below:
|  | Restricted Stock Units / Awards |  | Weighted Average Grant-Date Fair Value Per Unit / Award
Unvested RSUs and RSAs outstanding at January 1, 2012 |  | 1,208,166 |  |  |  | $ | 8.99 |  |
Granted |  | 1,168,172 |  |  |  | 16.94 |  |
Market value share count adjustment for liability awards |  | (84,858 | ) |  |  | 20.28 |  |
Vested |  | (865,833 | ) |  |  | 10.04 |  |
Forfeited |  | (34,813 | ) |  |  | 9.67 |  |
Unvested RSUs and RSAs outstanding at December 31, 2012 |  | 1,390,834 |  |  |  | $ | 14.31 |  |
Unvested and expected to vest RSUs and RSAs outstanding at December 31, 2012 |  | 1,149,735 |  |  |  | $ | 14.50 |  |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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