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Income Taxes - Reconciliation of Federal Income Tax Rate to Company's Effective Income Tax Rate (Details)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Effective income tax rate | ||||
| Federal income tax rate | 35.00% | 35.00% | 35.00% | 35.00% |
| Tax credits, net of equity adjustment | (1.00%) | 0.00% | (2.00%) | (1.00%) |
| Permanent differences | (1.00%) | (1.00%) | (1.00%) | (1.00%) |
| Effective income tax rate | 33.00% | 34.00% | 32.00% | 33.00% |