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Income Taxes (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income taxes |  |  |
Unrecognized tax benefits which, if recognized, would impact the company's effective tax rate | $ 19,100,000 | $ 10,400,000 |
Interest on income recognized on uncertain tax positions | 2,200,000 | 500,000 |
Penalties recognized on uncertain tax positions | 0 | 200,000 |
Accrued interest | 2,600,000 | 500,000 |
Accrued penalties | 0 | 200,000 |
Federal and state interest expense and penalties |  |  | 100,000
Interest and penalties accrued |  |  | 0
Reconciliation of the unrecognized tax benefits |  |  |
Balance beginning of year | 36,900,000 | 17,700,000 | 200,000
Increase based on prior year tax positions | 0 | 4,800,000 | 0
Decrease based on prior year tax positions | (6,400,000) | (100,000) | 0
Increases in current year tax positions | 14,700,000 | 14,700,000 | 17,500,000
Settlements | 0 | 0 | 0
Reductions related to expirations of statute of limitations | 0 | (200,000) | 0
Balance end of year | 45,200,000 | 36,900,000 | 17,700,000
State | Kansas |  |  |
Income taxes |  |  |
Tax credit carryforwards | 5,300,000 |  |
State | Oklahoma |  |  |
Income taxes |  |  |
Tax credit carryforwards | $ 8,900,000 |  |

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- Definition The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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