Sale-Leasebacks of Real Estate (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) warehouse	Dec. 31, 2018 USD ($)
Sale Leaseback Transaction [Line Items]
Total sale-leaseback financing obligations	$ 117,420	$ 118,920
1 warehouse – 2010
Sale Leaseback Transaction [Line Items]
Number of warehouses | warehouse	1
Interest Rate as of June 30, 2019	10.34%
Total sale-leaseback financing obligations	$ 19,144	19,265
11 warehouses – 2007
Sale Leaseback Transaction [Line Items]
Number of warehouses | warehouse	11
Total sale-leaseback financing obligations	$ 98,276	$ 99,655
11 warehouses – 2007 | Minimum
Sale Leaseback Transaction [Line Items]
Interest Rate as of June 30, 2019	7.00%
11 warehouses – 2007 | Maximum
Sale Leaseback Transaction [Line Items]
Interest Rate as of June 30, 2019	19.59%