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Debt and Financing Obligations - Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 18, 2020
Sep. 30, 2019
Dec. 31, 2019
Aug. 30, 2019
Jul. 31, 2019
Dec. 31, 2018
Jun. 01, 2015
Debt and Financing Obligations              
Loss on extinguishment of debt   $ 13,100,000 $ 13,080,000        
Senior Notes 6.25 Percent Due 2022              
Debt and Financing Obligations              
Aggregate principal amount           $ 375,000,000  
Stated interest rate (as a percent)     6.25% 6.25%      
Loss on extinguishment of debt     $ 13,100,000        
Cash call premium     6,900,000        
Write-off of a portion of the original issue discount and deferred financing fees     6,200,000        
Senior Notes 7.00 Percent Due 2023 [Member]              
Debt and Financing Obligations              
Aggregate principal amount     $ 300,000,000     $ 300,000,000 $ 300,000,000
Stated interest rate (as a percent)     7.00%       7.00%
Minimum percentage of principal amount held by trustee or the holders to declare notes due and payable     25.00%        
Indebtedness unpaid or accelerated debt triggering debt default     $ 50,000,000        
Period for payment of default     60 days        
Senior Notes 7.00 Percent Due 2023 [Member] | Redemption Period, 1st 12 month period              
Debt and Financing Obligations              
Redemption price as a percentage of principal amount     103.50%        
Senior Notes 7.00 Percent Due 2023 [Member] | Redemption Period. 2nd 12 month period              
Debt and Financing Obligations              
Redemption price as a percentage of principal amount     101.75%        
Senior Notes 7.00 Percent Due 2023 [Member] | Redemption Period, last period              
Debt and Financing Obligations              
Redemption price as a percentage of principal amount     100.00%        
Senior Notes 7.00 Percent Due 2027 [Member]              
Debt and Financing Obligations              
Aggregate principal amount     $ 400,000,000   $ 400,000,000    
Stated interest rate (as a percent)     7.00%   7.00%    
Minimum percentage of principal amount held by trustee or the holders to declare notes due and payable     25.00%        
Percentage of principal amount that the Partnership may redeem     35.00%        
Indebtedness unpaid or accelerated debt triggering debt default     $ 50,000,000        
Period for payment of default     60 days        
Senior Notes 7.00 Percent Due 2027 [Member] | Subsequent event              
Debt and Financing Obligations              
Percentage of notes exchanged for SEC registered notes 100.00%            
Senior Notes 7.00 Percent Due 2027 [Member] | Redemption Period, 1st 12 month period              
Debt and Financing Obligations              
Redemption price as a percentage of principal amount     107.00%        
Senior Notes 7.00 Percent Due 2027 [Member] | Redemption Period. 2nd 12 month period              
Debt and Financing Obligations              
Redemption price as a percentage of principal amount     103.50%        
Senior Notes 7.00 Percent Due 2027 [Member] | Redemption Period, 3rd 12 month period              
Debt and Financing Obligations              
Redemption price as a percentage of principal amount     102.333%        
Senior Notes 7.00 Percent Due 2027 [Member] | Redemption Period, 4th 12 month period              
Debt and Financing Obligations              
Redemption price as a percentage of principal amount     101.167%        
Senior Notes 7.00 Percent Due 2027 [Member] | Redemption Period, last period              
Debt and Financing Obligations              
Redemption price as a percentage of principal amount     100.00%