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Income Taxes - Schedule of Differences Between Federal Tax Rate and Company's Effective Tax Rate for Results of Continuing Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |
U.S. tax at statutory rate | $ 9,900 | $ 11,351 | $ 11,991
Tax legislation adjustment | (4,325) | 0 | 0
State income taxes, net of federal benefit and tax reform | 1,060 | 945 | 1,337
Excess equity compensation deduction | (1,139) | (911) | 0
Non-deductible expenses | 560 | 495 | 319
Other | (24) | 0 | 0
Total income tax provision | $ 6,032 | $ 11,880 | $ 13,647
U.S. tax at statutory rate | 35.00% | 35.00% | 35.00%
Tax legislation adjustment | (15.30%) | 0.00% | 0.00%
State income taxes, net of federal benefit and tax reform | 3.70% | 2.90% | 3.90%
Excess equity compensation deduction | (4.00%) | (2.80%) | (0.00%)
Nondeductible expenses | 2.00% | 1.50% | 0.90%
Other | (0.10%) | 0.00% | 0.00%
Total | 21.30% | 36.60% | 39.80%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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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