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Lubbock, Texas (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Business Interruption Loss [Line Items]              
Property and equipment       $ 229,221,000   $ 233,667,000  
Gain on insurance recovery       $ 1,170,000 $ 1,914,000    
Lubbock, Texas Interruption Loss [Member]              
Business Interruption Loss [Line Items]              
Property and equipment             $ 0
Insurance proceeds for inventory destroyed and fair value of building   $ 3,300,000          
Gain on insurance recovery   $ 1,900,000 $ 0        
Lubbock, Texas Interruption Loss [Member] | Inventory, Business Interruption and Other Expenses [Member]              
Business Interruption Loss [Line Items]              
Gain on insurance recovery           1,100,000  
Lubbock, Texas Interruption Loss [Member] | Business Interruption and Other Expenses [Member]              
Business Interruption Loss [Line Items]              
Gain on insurance recovery $ 200,000            
Lubbock, Texas Interruption Loss [Member] | Building [Member]              
Business Interruption Loss [Line Items]              
Gain on insurance recovery $ 1,000,000         $ 2,300,000