Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,688		$ 3,010
Oil & Gas [Member] | Fabrication Services [Member]
Restructuring Cost and Reserve [Line Items]
Impairment charge		$ 2,000
Equipment and Facility Lease Abandonment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,295		0
Loss on Sale of Subsidiary [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	123		0
Loss on Sale of Corporate Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0		1,979
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	57		283
Restatement Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	35		476
Accelerated Stock Vesting [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 178		$ 272