Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Allocation of Purchase Price (Details)

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Acquisitions - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 01, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Allocation of the purchase price paid to the fair value of the net assets for acquisition            
Goodwill   $ 241,006   $ 241,006   $ 241,006
Revenues   163,446 $ 139,371 247,410 $ 211,619  
Pre-tax operating losses   28,080 22,354 24,942 16,383  
Arrowhead Equipment, Inc. [Member]            
Acquisition            
Total consideration $ 7,385          
Allocation of the purchase price paid to the fair value of the net assets for acquisition            
Accounts receivable 852          
Inventories 1,547          
Prepaid and other current assets 6          
Property and equipment 624          
Goodwill 2,720          
Intangible assets 2,700          
Accounts payable and other current liabilities (957)          
Unfavorable lease (107)          
Total $ 7,385          
Revenues   2,602   5,740    
Pre-tax operating losses   $ 271   $ 584    
Amortization period of goodwill, for income tax purpose       15 years    
Arrowhead Equipment, Inc. [Member] | Selling, general and administrative expenses            
Acquisition            
Transactions expenses     $ 450   $ 488