Sale-Leasebacks of Real Estate - Narrative (Details) $ in Thousands	1 Months Ended
	Jul. 31, 2013 warehouse	Sep. 30, 2010 USD ($)	Sep. 30, 2007 USD ($) warehouse extension	Dec. 31, 2019 USD ($) warehouse	Dec. 31, 2018 USD ($)
Sale Leaseback Transaction [Line Items]
Total sale-leaseback financing obligations				$ 115,759	$ 118,920
1 warehouse – 2010
Sale Leaseback Transaction [Line Items]
Purchase option transferred		$ 18,300
Lease agreement term		20 years
Consideration to be used toward improvements		$ 1,000
Percentage of useful life where control maintained		90.00%
Purchase price option percentage		95.00%
Total sale-leaseback financing obligations		$ 18,200		$ 18,994	19,265
Receivable for improvements		1,000
Sale-leaseback financing obligations		$ 19,200
Number of warehouses | warehouse				1
11 warehouses – 2007
Sale Leaseback Transaction [Line Items]
Percentage of useful life where control maintained			90.00%
Total sale-leaseback financing obligations				$ 96,765	$ 99,655
Gross proceeds from sale-leaseback transaction			$ 170,700
Annual rent increase under sale-leaseback transaction	0.50%		1.75%
Number of extensions under sale-leaseback transaction | extension			4
Extension period under sale-leaseback transaction			5 years
Number of units where agreement was amended | warehouse	6
Number of warehouses | warehouse	11		11	11
Minimum | 11 warehouses – 2007
Sale Leaseback Transaction [Line Items]
Lease agreement term			10 years
Maximum | 11 warehouses – 2007
Sale Leaseback Transaction [Line Items]
Lease agreement term			20 years