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Investments (Tables)
12 Months Ended
Dec. 31, 2018
Investments [Abstract]  
Schedule of Variable Interest Entities The carrying amounts with the maximum exposure to loss of the Company as of December 31, 2018 and 2017, respectively, including the effects of the sale of the Company's 45% ownership interest in L B Pipe JV, are as follows:
December 31, 
20182017
L B Pipe JV equity method investment$— $3,875 
Revolving line of credit— 1,235 
Net investment in direct financing lease567 735 
Maximum exposure to loss $567 $5,845