Annual report pursuant to Section 13 and 15(d)

EQUITY (Common Stock Narrative) (Details)

v3.19.3.a.u2
EQUITY (Common Stock Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock issued in connection with stock incentive plans 1,300,000 2,300,000 3,500,000    
Conversion of convertible debt $ 28,586        
Shares available for future grants (in shares) 22,100,000        
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 11,347,000 11,784,000 14,239,000   16,283,000
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock awards 1,169,582 1,399,181 1,607,000   1,080,000
Market Based Stock Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested stock awards 1,686,000 200,000