Basis and Summary of Significant Accounting Policies - Hurricane Impact (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Accounting Policies [Abstract]
Partial cash payment from insurer	$ 0.4
Insurance settlements receivable	$ 3.2

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

No definition available.

Name:	us-gaap_InsuranceSettlementsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant