Leases (Details)	1 Months Ended	6 Months Ended
	Apr. 30, 2010 item	Jun. 30, 2019 agreement item
Lessee, Lease, Description [Line Items]
Remaining lease term		15 years
Option to renew - lessee		true
Number of sublease agreements		4
Number of renewal options reasonably certain to be exercised | item		0
Number of sublease agreements - contingent upon renewal		2
Number of sublease agreements - exercised		2
Minimum
Lessee, Lease, Description [Line Items]
Renewal of lease period		1 year
Maximum
Lessee, Lease, Description [Line Items]
Renewal of lease period		20 years
Master Lease
Lessee, Lease, Description [Line Items]
Number Of Renewal Terms | item	2
Percentage Of Increase In Operating Lease Rent	3.00%
Renewal of lease period		10 years