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Operating Segment and Related Information - Segment Reporting for Long-term investments, Property and Equipment - Net and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments $ 1,427,918 $ 1,354,370
Property, Plant and Equipment—Net 286,458 214,466
Total Assets 2,835,276 2,742,512
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, Plant and Equipment—Net 136,905 82,540
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, Plant and Equipment—Net 141,946 126,921
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, Plant and Equipment—Net 7,606 5,005
Operating Segments | Marine Services    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 40,698 27,324
Total Assets 275,660 249,003
Operating Segments | Insurance    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 1,407,996 1,314,448
Total Assets 2,027,059 1,965,059
Operating Segments | Life Sciences    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 13,067 4,888
Total Assets 28,868 16,494
Operating Segments | Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments 6,778 22,395
Total Assets 10,914 34,339
Operating Segments | Telecommunications    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 125,965 114,633
Operating Segments | Construction    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 295,246 268,242
Operating Segments | Energy    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 84,602 31,462
Non-operating Corporate    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total Assets 27,583 77,965
Eliminations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Investments (40,621) (14,685)
Total Assets $ (40,621) $ (14,685)