Restructuring - Summary of Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	$ 18,738	$ (882)	$ 32,019	$ 24
Right-of-Use Asset Impairment and Operating Lease Charges
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	15,266	207	24,788	926
Fixed Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	1,072	0	2,569	0
Severance
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	1,856	87	2,992	601
Other Expenses (Reversals)
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	544	(1,176)	1,670	(1,176)
Gain on Sale of Closed Store Properties
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	$ 0	$ 0	$ 0	$ (327)