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Long-term Obligations - ANG Term Loan (Details) - USD ($)
1 Months Ended
Aug. 05, 2016
Jun. 13, 2016
Oct. 31, 2013
Dec. 31, 2016
Dec. 12, 2016
Sep. 19, 2016
Dec. 31, 2015
Debt Instrument [Line Items]              
Outstanding debt       $ 388,702,000      
Term Loan | Note Payable Collateralized By Asset, 4.3%              
Debt Instrument [Line Items]              
Interest rate (as a percent)   4.30%          
Aggregate principal amount   $ 6,500,000.0          
Energy | Term Loan              
Debt Instrument [Line Items]              
Debt instrument term     5 years        
Interest rate (as a percent)     5.50%        
Outstanding debt       $ 500,000     $ 700,000
LIBOR | Term Loan | Note Payable Collateralized By Asset, 4.3%              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent)   3.00%          
Revolving Credit Facility | Revolving Demand Note Payable Collateralized By Asset, 4.3%              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 1,000,000.0          
Energy | Seller Note Due 2022, 4.25%              
Debt Instrument [Line Items]              
Interest rate (as a percent)       4.25%      
Outstanding debt       $ 2,796,000     0
Energy | Notes Due 2022, 4.3%              
Debt Instrument [Line Items]              
Interest rate (as a percent)       4.30%      
Outstanding debt       $ 2,408,000     0
Energy | Notes Due 2023, 4.7%              
Debt Instrument [Line Items]              
Interest rate (as a percent)       4.70% 4.70%    
Outstanding debt       $ 4,439,000     $ 0
Aggregate principal amount         $ 4,500,000.0    
Energy | Medium-term Notes | Notes Due 2022, 4.3%              
Debt Instrument [Line Items]              
Interest rate (as a percent)           4.30%  
Aggregate principal amount           $ 2,500,000.0  
Energy | Energy | Medium-term Notes | Seller Note Due 2022, 4.25%              
Debt Instrument [Line Items]              
Debt instrument term 6 years            
Interest rate (as a percent) 4.25%            
Aggregate principal amount $ 3,000,000.0