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Business Concentration (Details) - Geographic Concentration Risk | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
North Carolina |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 40.30% | 37.80% | 35.00%
Texas |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 18.50% | 18.90% | 19.70%
South Carolina |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 10.20% | 10.50% | 10.30%

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