v3.6.0.2

Income Taxes - Effective Tax Rate Differs from Statutory United States Federal Income Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Statutory Rate | 35.00% | 35.00% | 35.00%
Increases (Decreases) in United States Federal Taxes |  |  |
State Income Taxes, Net of Federal Income Tax Benefit | 2.60% | 2.70% | 2.60%
Federal Tax Credits | (1.10%) | (0.50%) | (1.80%)
Other, Net | (0.30%) | (0.90%) | (0.10%)
Effective Tax Rate | 36.20% | 36.30% | 35.70%

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