Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Assets held for sale:
Cash and cash equivalents	$ 1,641	$ 1,000	$ 0
Total current assets	81,262	70,314
Liabilities held for sale:
Total current liabilities	20,247	20,900
Disposal Group, Held-for-sale, Not Discontinued Operations
Assets held for sale:
Cash and cash equivalents	1,641
Receivables, net	7,630
Retainage	16
Contract assets	4,394
Inventories	5,804
Prepaid expenses and other current assets	579
Total current assets	20,064
Property, plant & equipment, less accumulated depreciation	57,951
Identified intangible assets, less accumulated amortization	3,219
Other Assets	28
Total assets held for sale	81,262
Liabilities held for sale:
Accounts payable	3,569
Accrued expenses	7,586
Contract liabilities	1,218
Total current liabilities	12,373
Long-term debt	7,757
Other non-current liabilities	117
Total liabilities held for sale	20,247
Bayou | Disposal Group, Held-for-sale, Not Discontinued Operations
Assets held for sale:
Cash and cash equivalents	1,641	989
Receivables, net	5,257	6,368
Retainage	0	0
Contract assets	1,659	1,299
Inventories	3,896	3,727
Prepaid expenses and other current assets	391	827
Total current assets	12,844	13,210
Property, plant & equipment, less accumulated depreciation	55,577	53,887
Identified intangible assets, less accumulated amortization	3,219	3,217
Other Assets	0	0
Total assets held for sale	71,640	70,314
Liabilities held for sale:
Accounts payable	2,258	5,763
Accrued expenses	2,001	1,805
Contract liabilities	1,178	5,478
Total current liabilities	5,437	13,046
Long-term debt	7,757	7,757
Other non-current liabilities	117	97
Total liabilities held for sale	13,311	$ 20,900
Australia | Disposal Group, Held-for-sale, Not Discontinued Operations
Assets held for sale:
Cash and cash equivalents	0
Receivables, net	2,373
Retainage	16
Contract assets	2,735
Inventories	1,908
Prepaid expenses and other current assets	188
Total current assets	7,220
Property, plant & equipment, less accumulated depreciation	2,374
Identified intangible assets, less accumulated amortization	0
Other Assets	28
Total assets held for sale	9,622
Liabilities held for sale:
Accounts payable	1,311
Accrued expenses	5,585
Contract liabilities	40
Total current liabilities	6,936
Long-term debt	0
Other non-current liabilities	0
Total liabilities held for sale	$ 6,936