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Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan 401(k) Retirement Savings Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 7.6 | $ 7.5 | $ 6.0

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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