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Long-Term Debt - Enterprise Notes (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 21, 2016
USD ($)
Sep. 30, 2014
USD ($)
Nov. 20, 2013
USD ($)
Mar. 02, 2011
USD ($)
shares
Feb. 15, 2011
USD ($)
item
Nov. 30, 2013
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Long-term debt                  
Interest             $ 61,889 $ 57,717 $ 54,843
Cash distribution to members $ 100,000           236,146 228,894 60,101
Outstanding notes             645,000    
Unamortized discount             $ 6,300 4,900  
Securities purchase agreement                  
Long-term debt                  
Interest         $ 300        
Repayments to related party         27,000        
Cash distribution to members         $ 85,000        
Number of preferred units available to purchase (in shares) | shares       70,000          
Aggregate purchase price       $ 70,000          
Number of freestanding instruments issued | item         2        
Percentage of preferred return             3.00%    
Preferred return payments paid             $ 6,400 $ 8,400 $ 2,100
Equity interest       44.999%          
Enterprise Notes | Securities purchase agreement                  
Long-term debt                  
Net proceeds from issuance of debt         $ 150,000        
Series A Notes | Securities purchase agreement                  
Long-term debt                  
Payment of debt     $ 80,000            
Debt issued         80,000        
Outstanding notes         68,100        
Unamortized discount     $ 5,400   $ 11,900        
Quarterly interest rate (as a percent)         3.00%        
Quarterly default interest rate (as a percent)         3.75%        
Series B Notes | Securities purchase agreement                  
Long-term debt                  
Interest           $ 31,400      
Debt issued         $ 70,000        
Outstanding notes         81,900        
Unamortized premium   $ 3,400     $ 11,900        
Quarterly interest rate (as a percent)         3.00%        
Quarterly default interest rate (as a percent)         3.75%        
Quarterly alternative interest rate (as a percent)         3.25%        
Period for which company entitled to elect to not pay the accrued interest | item         12        
Period for which company shall so elect or shall otherwise fail to pay all accrued interest | item         6        
Amount of debt converted to equity   $ 70,000              
Term Loan Note Payable | Securities purchase agreement                  
Long-term debt                  
Payment of debt         $ 27,000        
Swap term loan | Securities purchase agreement                  
Long-term debt                  
Payment of debt         $ 4,600