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Income Taxes - Differences between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Statutory federal income tax rate | 21.00% | 35.00% | 35.00%
State income taxes, net of federal tax benefit | 4.50% | 4.30% | 3.60%
Remeasurement of deferred taxes, associated with 2017 Tax Act | 0.00% | (37.60%) | 0.00%
Valuation allowance | 0.00% | 3.60% | (3.70%)
Domestic production deduction | (0.00%) | (2.30%) | (2.40%)
Tax planning benefits, excluding valuation allowance effects | (8.10%) | 0.00% | 0.00%
Tax reserves | (0.30%) | 0.10% | (1.00%)
Tax credits | (0.30%) | (0.90%) | (0.80%)
Foreign tax rate effects | 0.30% | (0.50%) | 0.80%
Other, net | (1.10%) | (0.90%) | (0.90%)
Effective income tax rate | 16.00% | 0.80% | 30.60%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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