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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, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Continuing operations | $ | 22,018 |  |  | $ | 15,623 |  |  | $ | 13,533 |
Discontinued operations | — |  |  | 576 |  |  | 878 |
Total | $ | 22,018 |  |  | $ | 16,199 |  |  | $ | 14,411 |
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, 2015 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, 2014 |  | 705,373 |  |  | 381,188 |  |  | 1,086,561 |  |  |  | $ | 24.88 |  |
Granted |  | 213,649 |  |  | 712,108 |  |  | 925,757 |  |  |  | $ | 40.49 |  |
Market value share count adjustment for liability awards |  | — |  |  | 18,619 |  |  | 18,619 |  |  |  | $ | 35.09 |  |
Vested |  | (423,280 | ) |  | (204,936 | ) |  | (628,216 | ) |  |  | $ | 24.76 |  |
Forfeited |  | (30,373 | ) |  | (25,728 | ) |  | (56,101 | ) |  |  | $ | 31.38 |  |
Unvested RSUs outstanding at December 31, 2015 |  | 465,369 |  |  | 881,251 |  |  | 1,346,620 |  |  |  | $ | 36.31 |  |
Unvested and expected to vest RSUs outstanding at December 31, 2015 |  | 437,699 |  |  | 826,620 |  |  | 1,264,319 |  |  |  | $ | 36.05 |  |
Schedule of Other Share-based Compensation, Activity [Table Text Block] | The following table summarizes the balance of liability awards and changes during the years presented (in thousands):
|  | 2015 |  | 2014 |  | 2013 |
Balances of liability awards at beginning of year |  | $ | 1,453 |  |  | $ | 2,500 |  |  | $ | 2,000 |  |
Granted |  | — |  |  | 500 |  |  | 1,000 |  |
Settled |  | (1,453 | ) |  | (1,497 | ) |  | (500 | ) |
Canceled |  | — |  |  | (50 | ) |  | — |  |
Balance of liability awards end of year |  | $ | — |  |  | $ | 1,453 |  |  | $ | 2,500 |  |
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, 2015:
|  | 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, 2015 |  |  |  | December 31, 2015 |
$ | 4.44 |  |  | - |  | $ | 8.26 |  |  | 73,901 |  |  | 4.0 |  |  | $ | 6.96 |  |  |  | 73,305 |  |  |  | $ | 6.95 |  |
$ | 10.46 |  |  | - |  | $ | 11.75 |  |  | 61,885 |  |  | 4.3 |  |  | $ | 10.88 |  |  |  | 60,755 |  |  |  | $ | 10.89 |  |
$ | 12.90 |  |  | - |  | $ | 12.90 |  |  | 120,000 |  |  | 1.1 |  |  | $ | 12.90 |  |  |  | 120,000 |  |  |  | $ | 12.90 |  |
$ | 13.31 |  |  | - |  | $ | 13.58 |  |  | 25,600 |  |  | 1.4 |  |  | $ | 13.33 |  |  |  | 25,506 |  |  |  | $ | 13.32 |  |
$ | 16.51 |  |  | - |  | $ | 16.51 |  |  | 75,000 |  |  | 6.7 |  |  | $ | 16.51 |  |  |  | 60,937 |  |  |  | $ | 16.51 |  |
$ | 4.44 |  |  | - |  | $ | 16.51 |  |  | 356,386 |  |  | 3.5 |  |  | $ | 12.11 |  |  |  | 340,503 |  |  |  | $ | 11.94 |  |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table is a summary of stock option activity during 2015:
|  | 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, 2014 |  | 4,267 |  |  | 690,614 |  |  | 694,881 |  |  | $ | 11.33 |  |  |  | 3.5 |  |  | $ | 15,189,000 |
Exercised |  | (4,267 | ) |  | (325,235 | ) |  | (329,502 | ) |  | $ | 10.54 |  |  |  |  |  |  |  |
Canceled |  | — |  |  | (8,993 | ) |  | (8,993 | ) |  | $ | 9.81 |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  | — |  |  | 356,386 |  |  | 356,386 |  |  | $ | 12.11 |  |  |  | 3.5 |  |  | $ | 11,705,000 |
Vested and Expected to Vest at December 31, 2015 |  | — |  |  | 356,386 |  |  | 356,386 |  |  | $ | 12.11 |  |  |  | 3.5 |  |  | $ | 11,705,000 |
Exercisable at December 31, 2015 |  | — |  |  | 340,503 |  |  | 340,503 |  |  | $ | 11.94 |  |  |  | 3.3 |  |  | $ | 11,241,000 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The table below presents the average fair value per share of shares purchased, and the compensation expense under the ESPP (dollars in thousands, except per share amounts):
Year Ended December 31, |  | Average fair value per share |  | Shares |  | Expense |
2015 |  | $7.77 |  | 204,401 |  | $ | 1,586 |  |
2014 |  | $8.35 |  | 207,805 |  | $ | 1,756 |  |
2013 |  | $7.16 |  | 203,200 |  | $ | 1,195 |  |

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