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OPERATING SEGMENT AND RELATED INFORMATION, Segment Reporting for Property, Plant and Equipment - Net and Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-term investments $ 71,793 $ 48,674
Property, plant and equipment-net 235,862 239,851
Total assets 794,552 724,048
Reportable Geographical Components [Member] | United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment-net 79,943 87,091
Reportable Geographical Components [Member] | United Kingdom [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment-net 150,711 147,323
Reportable Geographical Components [Member] | Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment-net 5,208 5,437
Operating Segments [Member] | Telecommunications [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total assets 70,788 24,501
Operating Segments [Member] | Life Sciences [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-term investments 1,623 1,916
Total assets 9,049 11,007
Operating Segments [Member] | Manufacturing [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total assets 294,455 281,067
Operating Segments [Member] | Utilities [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total assets 29,026 25,391
Operating Segments [Member] | Marine Services [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-term investments 27,869 26,401
Total assets 271,507 283,948
Operating Segments [Member] | Other Segments [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total assets [1] 7,878 6,369
Non-operating Segment [Member] | Corporate [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-term investments 42,301 20,357
Total assets $ 111,849 $ 91,765
[1] Other also includes property, plant and equipment - net and total assets related to discontinued operations.