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Restructuring Activities Restructuring Accruals (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Beginning Balance, Restructuring Accrual $ 4,205 $ 5,984 $ 7,324 $ 5,832
Restructuring Costs 2,749 305 12,417 6,303
Payments for Restructuring (3,821) (1,814) (16,608) (7,660)
Restructuring Reserve, Period Increase (Decrease) 194   194  
Ending Balance, Restructuring Reserve 3,327 4,475 3,327 4,475
Energy & Chemicals [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance, Restructuring Accrual 0 544 127 1,106
Restructuring Costs 162 159 2,245 821
Payments for Restructuring (157) (267) (2,367) (1,491)
Restructuring Reserve, Period Increase (Decrease) 194   194  
Ending Balance, Restructuring Reserve 199 436 199 436
Distribution & Storage [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance, Restructuring Accrual 1,865 4,796 2,864 3,446
Restructuring Costs 648 118 1,085 3,929
Payments for Restructuring (1,381) (1,160) (2,817) (3,621)
Restructuring Reserve, Period Increase (Decrease) 0   0  
Ending Balance, Restructuring Reserve 1,132 3,754 1,132 3,754
BioMedical [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance, Restructuring Accrual 847 368 1,308 430
Restructuring Costs 516 0 4,527 521
Payments for Restructuring (803) (168) (5,275) (751)
Restructuring Reserve, Period Increase (Decrease) 0   0  
Ending Balance, Restructuring Reserve 560 200 560 200
Corporate [Member]        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance, Restructuring Accrual 1,493 276 3,025 850
Restructuring Costs 1,423 28 4,560 1,032
Payments for Restructuring (1,480) (219) (6,149) (1,797)
Restructuring Reserve, Period Increase (Decrease) 0   0  
Ending Balance, Restructuring Reserve $ 1,436 $ 85 $ 1,436 $ 85