Leases Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease charges	$ 37,018
Sublease receipts	(1,676)
Cash paid for amounts included in measurement of operating lease liabilities	30,077
Cash paid for short-term operating leases not included in operating lease liabilities	6,941
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 3,927
Weighted-average discount rate	7.90%
Weighted-average remaining lease term	3 years
2019	$ 91,427
2020	100,444
2021	68,804
2022	40,369
2023	16,712
Thereafter	3,194
Total undiscounted operating lease liabilities	320,950
Less: Interest	(36,462)
Operating lease liabilities	284,488	$ 0
2019		145,345
2020		116,785
2021		80,362
2022		47,417
2023		16,460
Thereafter		2,280
Total future minimum rental payments		$ 408,649
Other store expenses [Member]
Lessee, Lease, Description [Line Items]
Operating lease charges	36,553
Other charges [Member]
Lessee, Lease, Description [Line Items]
Operating lease charges	$ 2,141