Subsequent Event (Details) $ in Millions	36 Months Ended
	Dec. 31, 2015 USD ($)	Feb. 28, 2019 branch property corporate_location
Subsequent Event [Line Items]
DC Solar tax credit benefits | $	$ 22.8
February sale leaseback agreement | Subsequent event
Subsequent Event [Line Items]
Number of properties | property		29
Number of corporate locations | corporate_location		1
Number of branches | branch		28