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Senior Debt (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Senior Debt (Table Details) [Abstract]              
Term loan, amount outstanding $ 49,100,000     $ 49,100,000   $ 49,100,000 $ 191,800,000
Revolving facility, amount outstanding 55,000,000     55,000,000   55,000,000 0
Unamortized Debt Issuance Expense 6,200,000     6,200,000   6,200,000 5,100,000
Mandatory Excess Cash Flow Pre-Payment       $ 141,000,000     27,000,000
Commitment fee percentage       0.50%      
Dividends paid       $ (12,811,000) $ (21,291,000)    
Senior credit facility, maximum amount 350,000,000     350,000,000   350,000,000  
Senior credit facilities, additional amount allowed 100,000,000     100,000,000   100,000,000  
Debt refinancing charges 0 $ 1,900,000 $ 0 1,936,000 $ 0    
Debt arrangement and amendment fees   $ 5,300,000          
Letters of credit, amount outstanding $ 86,000,000     $ 86,000,000   $ 86,000,000  
Financial Covenants Ratios (Table Details) [Abstract]              
Required consolidated fixed charge coverage ratio, minimum 1.1     1.1   1.1  
Actual consolidated fixed charge coverage ratio 0.45     0.45   0.45  
Covenants [Abstract]              
Covenants for senior credit facilities - amount available under restricted payment basket $ 15,000,000     $ 15,000,000   $ 15,000,000  
Adjusted consolidated EBITDA           21,500,000  
Consolidated fixed charges           $ 47,700,000  
Event of default-3rd party ownership % of our voting stock 35.00%     35.00%   35.00%  
Event of default-not satisfied or bonded judgment in excess of $ 50,000,000     $ 50,000,000   $ 50,000,000  
Maximum period allowed for pending judgment to satisfy or bond (in days) 30     30   30  
Unsecured line of credit, maximum facility $ 20,000,000     $ 20,000,000   $ 20,000,000  
Unsecured line of credit, amount outstanding 1,100,000     1,100,000   1,100,000 $ 0
Maturities of Long-term Debt [Abstract]              
2017 1,632,000     1,632,000   1,632,000  
2018 2,250,000     2,250,000   2,250,000  
2019 57,250,000     57,250,000   57,250,000  
2020 2,250,000     2,250,000   2,250,000  
2021 41,813,000     41,813,000   41,813,000  
Thereafter 0     0   0  
Total senior debt 105,195,000     105,195,000   105,195,000  
Dividend annual limit [Member]              
Senior Debt (Table Details) [Abstract]              
Equity Restrictions 15,000,000     $ 15,000,000   15,000,000  
Minimum [Member]              
Senior Debt (Table Details) [Abstract]              
Commitment fee percentage       0.30%      
Maximum [Member]              
Senior Debt (Table Details) [Abstract]              
Commitment fee percentage       0.50%      
Prime Rate [Member]              
Senior Debt (Table Details) [Abstract]              
Description of variable rate basis       prime      
Eurodollar [Member]              
Senior Debt (Table Details) [Abstract]              
Description of variable rate basis       Eurodollar rate      
Line of Credit [Member]              
Covenants [Abstract]              
Unsecured line of credit, amount outstanding 1,070,000     $ 1,070,000   1,070,000  
Maturities of Long-term Debt [Abstract]              
2017 1,070,000     1,070,000   1,070,000  
2018 0     0   0  
2019 0     0   0  
2020 0     0   0  
2021 0     0   0  
Thereafter 0     0   0  
Revolving Credit Facility [Member]              
Senior Debt (Table Details) [Abstract]              
Revolving facility, amount outstanding 55,000,000     $ 55,000,000   55,000,000  
Maturity date       Mar. 19, 2019      
Covenants [Abstract]              
Line of Credit Facility, Remaining Borrowing Capacity 147,500,000     $ 147,500,000   147,500,000  
Maturities of Long-term Debt [Abstract]              
2017 0     0   0  
2018 0     0   0  
2019 55,000,000     55,000,000   55,000,000  
2020 0     0   0  
2021 0     0   0  
Thereafter $ 0     $ 0   $ 0  
Revolving Credit Facility [Member] | Prime Rate [Member]              
Senior Debt (Table Details) [Abstract]              
Margin on Prime Rate, actual 2.00%     2.00%   2.00%  
Revolving Credit Facility [Member] | Prime Rate [Member] | Minimum [Member]              
Senior Debt (Table Details) [Abstract]              
Basis margin on variable rate       0.50%      
Revolving Credit Facility [Member] | Prime Rate [Member] | Maximum [Member]              
Senior Debt (Table Details) [Abstract]              
Basis margin on variable rate       2.00%      
Revolving Credit Facility [Member] | Eurodollar [Member]              
Senior Debt (Table Details) [Abstract]              
Margin on Eurodollar rate, actual 3.00%     3.00%   3.00%  
Revolving Credit Facility [Member] | Eurodollar [Member] | Minimum [Member]              
Senior Debt (Table Details) [Abstract]              
Basis margin on variable rate       1.50%      
Revolving Credit Facility [Member] | Eurodollar [Member] | Maximum [Member]              
Senior Debt (Table Details) [Abstract]              
Basis margin on variable rate       3.00%      
Term Loan [Member]              
Senior Debt (Table Details) [Abstract]              
Term loan, amount outstanding $ 49,125,000     $ 49,125,000   $ 49,125,000  
Maturity date       Mar. 19, 2021      
Term Loan, Periodic Payment, Principal       $ 562,500      
Margin on Eurodollar rate, actual 3.00%     3.00%   3.00%  
Margin on Prime Rate, actual 2.00%     2.00%   2.00%  
Maturities of Long-term Debt [Abstract]              
2017 $ 562,000     $ 562,000   $ 562,000  
2018 2,250,000     2,250,000   2,250,000  
2019 2,250,000     2,250,000   2,250,000  
2020 2,250,000     2,250,000   2,250,000  
2021 41,813,000     41,813,000   41,813,000  
Thereafter $ 0     $ 0   $ 0