Income Taxes Income tax rate reconciliation (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income tax rate reconciliation [Abstract]
Statutory federal income tax rate	35.00%	(35.00%)	35.00%
State and other taxes, net of federal tax benefit	3.70%	(0.40%)	5.80%
Change in unrecognized tax benefit	(4.00%)	(28.10%)	(9.70%)
Change in valuation allowance	1.70%	(1.50%)	7.50%
State adjustments including audits and settlements	0.20%	(0.60%)	4.50%
Compensation related tax credits, net of deduction offsets	(4.90%)	(46.00%)	(14.90%)
Changes in tax rates and state laws	(3.90%)	0.00%	(6.50%)
Kansas high performance incentive program credits	0.50%	0.00%	(7.30%)
Goodwill intangibles adjustment	0.00%	27.00%	0.00%
Non-deductible preferred stock issuance costs	0.00%	8.50%	0.00%
Other	0.10%	(0.80%)	(0.30%)
Effective tax rate	28.40%	(76.90%)	14.10%

Effective Income Tax Rate Reconciliation, Change in Unrecognized Tax Benefits

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Effective Income Tax Rate Reconciliation, Non-deductible preferred stock issuance costs

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Effective Income Tax Reconciliation, High Performance Incentive Program Credits

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 740

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-Subparagraph (SAB TOPIC 6.I)

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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-Name Accounting Standards Codification

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-Topic 740

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-Subparagraph (SAB TOPIC 6.I)

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to nondeductible impairment losses under enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to differences in the deductibility or nondeductibility of incentive stock options and other equity-based compensation costs in accordance with generally accepted accounting principles and enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to domestic income tax settlements during the period.

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