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Employee Benefits (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Definedcontributionemployeeautomaticcontributionpercentag | 6.00% |  |
Employer matching contributions | $ 8,100,000 | $ 6,100,000 | $ 5,900,000
Administrative expenses | $ 0 | 0 | 40,000
Profits sharing, percent of pre-tax profit paid to eligible employees on quarterly basis | 10.00% |  |
Profit sharing expense | $ 6,200,000 | $ 8,400,000 | $ 9,000,000
Effective January 1, 2016 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of match | 175.00% |  |
Maximum annual contributions per employee, percent | 6.00% |  |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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