Leases - Narrative (Details)	3 Months Ended
Mar. 31, 2019
Leases [Abstract]
Lessee, Operating Lease, Description	expire at various dates through 2036
Lessee, Operating Lease, Variable Lease Payment, Terms and Conditions	Variable lease payments are generally expensed as incurred and include certain index-based changes in rent, certain nonlease components, such as maintenance and other services provided by the lessor, and other charges included in the lease.

Description of basis, terms, and conditions on which variable lease payment for lessee's operating lease is determined.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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