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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 (RSU and RSAs) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended
	Mar. 04, 2013	Dec. 31, 2013 Restricted Stock Units and Awards [Member]	May 15, 2013 Performance Based Award	Jun. 01, 2013 Other Executive Officers Performance Based Award	Mar. 04, 2013 Other Executive Officers Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested RSUs and RSAs outstanding at January 1, 2012 (in shares)		1,390,834
Granted (in shares)	143,182	621,262	59,942
Market value share count adjustment for liability awards (in shares)		(55,664)
Vested (in shares)		(538,525)
Forfeited (in shares)		(50,669)
Unvested RSUs and RSAs outstanding at December 31, 2012 (in shares)		1,367,238
Unvested and expected to vest RSUs and RSAs outstanding at December 31, 2012 (in shares)		1,201,190
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested RSUs and RSAs outstanding at January 1, 2012, weighted average grant date fair value (in dollars per share)		$ 14.31
Granted, weighted average grant date fair value (in dollars per share)		$ 26.77
Market value share count adjustment for liability awards, weighted average grant date fair value (in dollars per share)		$ 34.92
Vested, weighted average grant date fair value (in dollars per share)		$ 14.76
Forfeited, weighted average grant date fair value (in dollars per share)		$ 15.75
Unvested RSUs and RSAs outstanding at December 31, 2012, weighted average grant date fair value (in dollars per share)		$ 18.90
Unvested and expected to vest RSUs and RSAs outstanding at December 31, 2012, weighted average grant date fair value (in dollars per share)		$ 19.12
Grant date fair value	$ 3.2			$ 0.1	$ 1.0

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made 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).

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