Restructuring - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		36 Months Ended	45 Months Ended
	Sep. 30, 2019 USD ($) store	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) store	Sep. 30, 2018 USD ($)	Dec. 31, 2018 store	Sep. 30, 2019 USD ($) store
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	$ 5,516	$ 537	$ 37,535	$ 561
Restructuring Program 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of store closures | store			154
Total Restructuring Expenses	5,200		$ 36,200
Restructuring Program 2016 and 2017
Restructuring Cost and Reserve [Line Items]
Total Restructuring Expenses	300		1,300			$ 40,600
Gain on Sale of Closed Store Properties
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, number of store closures | store					139
Total Restructuring Expenses	$ 1,065	$ (49)	$ 1,065	$ (376)
CANADA | Restructuring Program 2019
Restructuring Cost and Reserve [Line Items]
Number of stores | store	6		6			6