Leases (Short Term Leases) (Details)	6 Months Ended
Jun. 30, 2019
Low
Lessee, Lease, Description [Line Items]
Short term leases, term	1 month
High
Lessee, Lease, Description [Line Items]
Short term leases, term	6 months

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.

No definition available.

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration