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Accounting Policies - VIEs, Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Current assets $ 51,354 $ 60,730
Non-current assets 25,607 26,316
Current liabilities 29,324 24,784
Non-current liabilities $ 28,849 25,728
Bayou Perma-Pipe Canada, Ltd | Disposed of by Sale    
Variable Interest Entity [Line Items]    
Total assets held for sale   21,060
Total liabilities held for sale   $ 6,961