Annual report pursuant to Section 13 and 15(d)

EQUITY (Common Stock Narrative) (Details)

v3.20.4
EQUITY (Common Stock Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock issued in connection with stock incentive plans 3,200,000 1,300,000 2,300,000    
Conversion of convertible debt   $ 28,586      
Shares available for future grants (in shares) 19,000,000.0        
2.5% Convertible Senior Notes Due 2019 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued in connection with the conversion of convertible debt   800,000      
Interest rate, stated percentage   2.50%   2.50%  
Conversion of convertible debt   $ 28,600      
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options currently granted 9,323,000 11,347,000 11,784,000   14,239,000
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock awards 1,589,073 1,169,582 1,399,000   1,607,000
Market Based Stock Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock awards 2,367,000 1,686,000