Restructuring - Summary of Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	$ 906	$ 327
Contractual Lease Obligations
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	719	(523)
Severance
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	514	446
Gain on Sale of Closed Store Properties
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	(327)	0
Fixed Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	$ 0	$ 404