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Fair Value Measurements - Schedule of Fair Value of Liabilities (Details) - USD ($)
Jun. 30, 2021
Mar. 26, 2021
Mar. 19, 2021
Dec. 31, 2020
May 22, 2020
Mar. 15, 2019
Nov. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Long-term debt, net $ 1,054,317,000     $ 1,068,624,000      
Senior Notes              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Long-term debt, net $ 799,317,000     $ 738,624,000      
Senior Secured Note Due 2025 [Member] | Senior Notes              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Interest rate, stated percentage 8.00%     8.00% 8.00%    
Debt Instrument, Face Amount $ 0     $ 127,073,000 $ 127,100,000    
Fair value of debt instrument $ 0     $ 114,366,000      
Senior Notes Due 2026 | Senior Notes              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Interest rate, stated percentage 5.375%     5.375%     5.375%
Debt Instrument, Face Amount $ 289,448,000     $ 289,448,000     $ 400,000,000.0
Fair value of debt instrument $ 283,659,000     $ 206,955,000      
Senior Notes Due 2027 | Senior Notes              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Interest rate, stated percentage 6.875%     6.875%   6.875%  
Debt Instrument, Face Amount $ 356,351,000     $ 356,351,000   $ 500,000,000.0  
Fair value of debt instrument $ 364,405,000     $ 254,791,000      
Convertible Senior Notes Due 2028 | Convertible Notes Payable              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Interest rate, stated percentage 3.25%   3.25% 3.25%      
Debt Instrument, Face Amount $ 170,000,000 $ 20,000,000.0 $ 150,000,000.0 $ 0      
Fair value of debt instrument 219,606,000     0      
Carrying Value | Senior Secured Note Due 2025 [Member] | Senior Notes              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Long-term debt, net 0     103,901,000      
Carrying Value | Senior Notes Due 2026 | Senior Notes              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Long-term debt, net 285,261,000     284,867,000      
Carrying Value | Senior Notes Due 2027 | Senior Notes              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Long-term debt, net 350,276,000     349,856,000      
Carrying Value | Convertible Senior Notes Due 2028 | Convertible Notes Payable              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Long-term debt, net 163,780,000     0      
Revolving Credit Facility | Line of Credit              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Long-term Debt, Gross 255,000,000     330,000,000      
Debt Instrument, Face Amount 255,000,000     330,000,000      
Fair value of debt instrument 255,000,000     330,000,000      
Revolving Credit Facility | Carrying Value | Line of Credit              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Long-term Debt, Gross $ 255,000,000     $ 330,000,000