Other Charges - Operating Expenses Restructuring charges (Details) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Store Consolidation Plan - Number of Stores Closed	96
Restructuring and Related Cost, Future Lease Obligation				$ 1,229
Restructuring Charges				$ 4,569
u.s. core [Member]
Restructuring Cost and Reserve [Line Items]
Store Consolidation Plan - Number of Stores Closed	167
Mexico [Member] | Mexico Store Consolidation Plan [Member]
Restructuring Cost and Reserve [Line Items]
Store Consolidation Plan - Number of Stores Closed		14	34
Restructuring Charges			$ 3,100