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Other income, net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Other income, net [Abstract]        
Value of property and its content of Lubbock store       $ 0
Insurance proceeds for inventory destroyed and fair value of building $ 3,300      
Gain on insurance recovery $ 1,900 $ 1,914 $ 0