Leases - Narrative (Details) $ in Millions	6 Months Ended
Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Non-lease component Gain or (loss) on termination of lease	$ 1.6
Member Units [Member]
Lessee, Lease, Description [Line Items]
Sublease income	$ 0.9

Amount of gain (loss) on termination of lease before expiration of lease term.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 40
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77888415&loc=SL77918607-209975

Name:	us-gaap_GainLossOnTerminationOfLease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration