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Debt Obligations - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
May 07, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Total $ 706,576   $ 601,118
Original issue discount and debt issuance costs on Senior Secured Notes (4,356)   (7,946)
Debt obligations $ 702,220   593,172
11.0% Senior Secured Notes, due in 2019      
Debt Instrument [Line Items]      
Interest rate (as a percent) 11.00% 11.00%  
Corporate | 11.0% Senior Secured Notes, due in 2019      
Debt Instrument [Line Items]      
Long-term debt $ 510,000   400,000
Construction | LIBOR | LIBOR plus 2.50% Line of Credit | Real Estate Term Advance      
Debt Instrument [Line Items]      
Long-term debt $ 10,000   0
Interest rate (as a percent) 2.50%    
Construction | LIBOR | LIBOR plus 2.25% Notes, due in 2024 | Real Estate Term Advance      
Debt Instrument [Line Items]      
Long-term debt $ 4,713   6,738
Basis spread on variable rate (as a percent) 2.25%    
Construction | LIBOR | LIBOR plus 1.50% Line of Credit | Real Estate Term Advance      
Debt Instrument [Line Items]      
Long-term debt $ 37,312   19,670
Basis spread on variable rate (as a percent) 1.50%    
Marine Services      
Debt Instrument [Line Items]      
Obligations under capital leases $ 42,178   48,500
Marine Services | Notes payable and revolving lines of credit, various maturity dates      
Debt Instrument [Line Items]      
Long-term debt 28,145   23,748
Energy      
Debt Instrument [Line Items]      
Other 3,410   4,363
Energy | 4.50% Note due in 2022      
Debt Instrument [Line Items]      
Long-term debt $ 11,619   12,454
Interest rate (as a percent) 4.50%    
Energy | 5.04% Term Loan due in 2022      
Debt Instrument [Line Items]      
Long-term debt $ 12,731   13,706
Interest rate (as a percent) 5.00%    
Life Sciences | 11.0% Notes, various maturity dates      
Debt Instrument [Line Items]      
Long-term debt $ 1,475   1,750
Interest rate (as a percent) 11.00%    
Broadcasting | Notes payable and revolving lines of credit, various maturity dates      
Debt Instrument [Line Items]      
Long-term debt $ 9,993   10,135
Broadcasting | LIBOR plus applicable margin Bridge Note, due in 2018      
Debt Instrument [Line Items]      
Long-term debt 0   60,000
Broadcasting | 8.50% Note due 2019      
Debt Instrument [Line Items]      
Long-term debt $ 35,000   0
Interest rate (as a percent) 8.50%    
Other | Notes payable and revolving lines of credit, various maturity dates      
Debt Instrument [Line Items]      
Long-term debt $ 0   $ 54