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Commitments and Contingencies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |
Payments for general liability per occurrence | $ 100,000
Claim amounts that affect ultimate liability | 350,000
Maximum liability | 4,000,000
Minimum |
Loss Contingencies [Line Items] |
Payments for workers compensation per occurrence | 1,600
Maximum |
Loss Contingencies [Line Items] |
Payments for workers compensation per occurrence | $ 250,000

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- Definition General Liability And Workers Compensation Claim Per Occurrence That Would Affect Ultimate Liability + References No definition available. + Details
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