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Employee Benefits - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Definedcontributionemployeeautomaticcontributionpercentag |  | 6.00% |  |
Company 401K plan contribution (percentage) | 1.50% | 3.00% |  |
Employee salary deferral contributions percentage vested |  | 100.00% |  |
Employer contribution annual vesting percentage |  | 20.00% |  |
Employer matching contribution, percent of match |  | 100.00% |  |
Maximum annual contributions per employee, percent |  | 6.00% |  |
Employer contribution vesting period |  | years two through six of employment |  |
Employer matching contributions |  | $ 9.0 | $ 6.8 | $ 3.0
Administrative expenses |  | $ 0.1 | 0.2 | 0.2
Profits sharing, percent of pre-tax profit paid to eligible employees on quarterly basis |  | 10.00% |  |
Profit sharing expense |  | $ 8.0 | $ 7.8 | $ 6.4
Effective January 1, 2016 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company 401K plan contribution (percentage) |  | 3.00% |  |
Employer matching contribution, percent of match |  | 175.00% |  |
Maximum annual contributions per employee, percent |  | 6.00% |  |
Over Two Years |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company 401K plan contribution (percentage) |  | 3.00% |  |

X
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- Definition Period during which employees are vested in defined contribution plan. + References No definition available. + Details
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- Definition Employee automatic contribution percentage + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of administrative expenses incurred by a defined contribution plan. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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