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DEBT - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
Jun. 30, 2022
USD ($)
Dec. 07, 2021
USD ($)
Jul. 10, 2020
USD ($)
May 02, 2017
USD ($)
$ / shares
Mar. 13, 2017
USD ($)
$ / shares
Jan. 06, 2022
Dec. 31, 2021
USD ($)
segment
$ / shares
Dec. 31, 2022
USD ($)
payment
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 07, 2026
USD ($)
Jan. 07, 2022
USD ($)
Dec. 06, 2021
$ / shares
shares
Jul. 07, 2020
$ / shares
Mar. 07, 2017
$ / shares
DEBT AND FINANCING OBLIGATIONS                                  
Proceeds from debt                   $ 363,750 $ 0 $ 0          
Prepayment penalty, year 1               3.00%   3.00%              
Prepayment penalty, year 2               2.00%   2.00%              
Prepayment penalty, year 4 and thereafter               1.00%   1.00%              
Settlement period - convertible debt conversion request           40 days       40 days              
Closing sale price (in dollars per share) | $ / shares               $ 60.17   $ 60.17              
Deferred tax associated with equity component of convertible debt                   $ 20,500 20,450            
Amortization period of transaction costs attributable to liability component of convertible debt                   5 years              
Transaction costs attributable to equity component of convertible debt                   $ 2,700              
Loss on early extinguishment of debt                   $ 0 8,071 $ 0          
2.375% Convertible Senior Notes Due 2022                                  
DEBT AND FINANCING OBLIGATIONS                                  
Stated interest rate (as a percent)               2.375%   2.375%              
Initial conversion price of notes into common stock (in dollars per share) | $ / shares           $ 66.89   $ 66.89   $ 66.89              
Convertible debt, premium on common stock           37.50%                      
Closing sale price (in dollars per share) | $ / shares                                 $ 48.65
Assumed borrowing rate           7.45%                      
Carrying amount of equity component           $ 70,900                      
Total transaction costs           $ 11,000                      
Amortization period of transaction costs attributable to liability component of convertible debt                   5 years              
Initial conversion rate of common stock per $1,000 of principal amount of notes           0.0149                      
Debt redemption price due to fundamental change as a percentage of principal           100.00%                      
Convertible debt           $ 274,100                      
Customary events of default, percentage of principal and accrued and unpaid interest           100.00%                      
2.375% Convertible Senior Notes Due 2022 | Conversion terms prior to close of business on business day immediately proceeding October 1, 2021                                  
DEBT AND FINANCING OBLIGATIONS                                  
Market price per $1000 of principal amount of notes               1.144   1.144              
2.375% Convertible Senior Notes Due 2022 | Debt Redemption Terms on or after April 1, 2020                                  
DEBT AND FINANCING OBLIGATIONS                                  
Debt instrument, percentage of principal amount for computation of redemption price           100.00%                      
Conversion obligation, stock closing price minimum as a percentage of conversion price           130.00%                      
Conversion obligation, number of trading days           20 days                      
Conversion obligation, number of consecutive trading days           30 days                      
0.750% Convertible Senior Notes Due 2025                                  
DEBT AND FINANCING OBLIGATIONS                                  
Stated interest rate (as a percent)               0.75%   0.75%              
Percentage of last sale price of common stock               98.00%                  
Initial conversion price of notes into common stock (in dollars per share) | $ / shares               $ 71.78   $ 71.78           $ 71.78  
Convertible debt, premium on common stock                               32.50%  
Closing sale price (in dollars per share) | $ / shares                               $ 54.17  
Debt instrument, percentage of principal amount for computation of redemption price               100.00%                  
Market price per $1000 of principal amount of notes               1.113   1.113              
Initial conversion rate of common stock per $1,000 of principal amount of notes                   0.0139324              
0.750% Convertible Senior Notes Due 2025 | Debt Conversion Terms Business Day Immediately Preceding February 3, 2020                                  
DEBT AND FINANCING OBLIGATIONS                                  
Threshold trading days | segment               20                  
Threshold consecutive trading days | segment               30                  
Threshold percentage stock price trigger               130.00%                  
0.750% Convertible Senior Notes Due 2025 | Debt Redemption Terms on or after August 1, 2023                                  
DEBT AND FINANCING OBLIGATIONS                                  
Threshold trading days | segment               20                  
Threshold consecutive trading days | segment               30                  
Threshold percentage stock price trigger               130.00%                  
Debt instrument, percentage of principal amount for computation of redemption price               100.00%                  
7.000% Term Loan B Facility Maturing 2026                                  
DEBT AND FINANCING OBLIGATIONS                                  
Leverage ratio               1.75   1.75              
Leverage ratio maximum amount               $ 150,000   $ 150,000              
Weighted average interest rate, at point in time               7.75%   7.75%              
7.000% Term Loan B Facility Maturing 2026 | Adjusted Term SOFR Rate                                  
DEBT AND FINANCING OBLIGATIONS                                  
Basis spread one on variable rate                   1.00%              
Basis spread two on variable rate                   7.00%              
7.000% Term Loan B Facility Maturing 2026 | Adjusted Term SOFR Rate | Minimum                                  
DEBT AND FINANCING OBLIGATIONS                                  
Variable rate                   0.75%              
7.000% Term Loan B Facility Maturing 2026 | Alternative Base Rate                                  
DEBT AND FINANCING OBLIGATIONS                                  
Basis spread on variable rate                   6.00%              
7.000% Term Loan B Facility Maturing 2026 | Alternative Base Rate | Minimum                                  
DEBT AND FINANCING OBLIGATIONS                                  
Variable rate                   1.75%              
7.000% Term Loan B Facility Maturing 2026 | NYFRB Rate | Minimum                                  
DEBT AND FINANCING OBLIGATIONS                                  
Basis spread on variable rate                   0.50%              
3.375% Convertible Senior Notes Due 2024 | Subsequent Event                                  
DEBT AND FINANCING OBLIGATIONS                                  
Debt instrument, percentage of principal amount for computation of redemption price             100.00%                    
3.375% Convertible Senior Notes Due 2024 | Flexion                                  
DEBT AND FINANCING OBLIGATIONS                                  
Initial conversion price of notes into common stock (in dollars per share) | $ / shares         $ 26.78                   $ 317.40    
Initial conversion rate of common stock per $1,000 of principal amount of notes         0.0373413                        
CVRs issued per principal amount | shares                             37.3413    
Term Loan | 7.000% Term Loan B Facility Maturing 2026                                  
DEBT AND FINANCING OBLIGATIONS                                  
Discount rate     3.00%                            
Debt instrument, face amount     $ 375,000                            
Proceeds from debt     363,800                            
Discount     $ 11,200         $ 11,060   $ 11,060              
Convertible senior notes, gross               375,000   375,000              
Long-term debt outstanding               359,497   359,497 0            
Term Loan | 7.000% Term Loan B Facility Maturing 2026 | Forecast                                  
DEBT AND FINANCING OBLIGATIONS                                  
Quarterly payment $ 14,100 $ 9,400                              
Balloon payment                         $ 188,000        
Term Loan | 7.000% Term Loan B Facility Maturing 2026 | Subsequent Event | Forecast                                  
DEBT AND FINANCING OBLIGATIONS                                  
Quarterly payment                 $ 28,100                
Number of payments | payment                 3                
Unsecured Debt                                  
DEBT AND FINANCING OBLIGATIONS                                  
Long-term debt outstanding               1,049,230   1,049,230 462,678            
Unsecured Debt | 2.375% Convertible Senior Notes Due 2022                                  
DEBT AND FINANCING OBLIGATIONS                                  
Discount               1,920   1,920 9,263            
Convertible senior notes, gross               $ 160,000   $ 160,000 160,000            
Stated interest rate (as a percent)       2.375%   2.375%   2.375%   2.375%              
Debt issued in private placement           $ 345,000                      
Debt instrument, repurchased face amount       $ 185,000                          
Repayments of debt       211,100                          
Loss on early extinguishment of debt       8,100                          
Remaining payment required upon settlement of 2022 notes                   $ 160,000              
Long-term debt outstanding               $ 157,857   157,857 149,648            
Unsecured Debt | 0.750% Convertible Senior Notes Due 2025                                  
DEBT AND FINANCING OBLIGATIONS                                  
Debt instrument, face amount       $ 402,500                          
Discount               64,718   64,718 80,530            
Convertible senior notes, gross               $ 402,500   $ 402,500 402,500            
Stated interest rate (as a percent)       0.75%       0.75%   0.75%              
Debt issued in private placement           $ 390,000       $ 402,500              
Long-term debt outstanding               $ 330,627   330,627 $ 313,030            
Unsecured Debt | 3.375% Convertible Senior Notes Due 2024 | Subsequent Event                                  
DEBT AND FINANCING OBLIGATIONS                                  
Aggregate principal retired                           $ 192,600      
Unsecured Debt | 3.375% Convertible Senior Notes Due 2024 | Flexion                                  
DEBT AND FINANCING OBLIGATIONS                                  
Debt instrument, face amount         $ 201,300                        
Stated interest rate (as a percent)         3.375%                        
Convertible Debt | 0.750% Convertible Senior Notes Due 2025                                  
DEBT AND FINANCING OBLIGATIONS                                  
Convertible debt, carrying amount of liability component               314,700   $ 314,700              
Assumed borrowing rate                   5.78%              
Carrying amount of equity component               $ 87,800   $ 87,800              
Amortization period of equity component of convertible debt                   5 years              
Total transaction costs                   $ 12,500