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Commitments and Contingencies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |
Claim amounts that affect ultimate liability | $ 100,000
Payments for general liability per occurrence | 350,000
Maximum liability | 4,000,000
Commercial insurance coverage | 75,000,000
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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