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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings (Deficit)
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2016   222,401,000        
Beginning balance at Dec. 31, 2016 $ 1,311,319 $ 2,802 $ 1,036,786 $ 317,270 $ (32,977) $ (12,562)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (159,457)     (159,457)    
Foreign currency translation adjustments 2,345       2,345  
Unrealized gain (loss) on marketable securities (340)       (340)  
Equity-based compensation expense 13,825   13,825      
Common stock dividends ($0.225 per share) (50,154)     (50,154)    
Common shares issued upon vesting of share-based awards (in shares)   1,017,000        
Common shares issued upon vesting of share-based awards 0 $ 11 (11)      
Common shares issued for employee stock purchase plan (“ESPP”) (in shares)   50,000        
Common shares issued for employee stock purchase plan (“ESPP”) 524 $ 1 523      
Treasury shares issued upon vesting of share-based awards (in shares)   4,000        
Treasury shares issued upon vesting of share-based awards (18)   (84)     66
Treasury shares issued for ESPP (in shares)   105,000        
Treasury shares issued for ESPP 740   (166) (736)   1,642
Treasury shares withheld (in shares)   (288,000)        
Treasury shares withheld (2,883)         (2,883)
Ending balance (in shares) at Dec. 31, 2017   223,289,000        
Ending balance at Dec. 31, 2017 1,115,901 $ 2,814 1,050,873 106,923 (30,972) (13,737)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (90,733)     (90,733)    
Foreign currency translation adjustments (1,452)       (1,452)  
Unrealized gain (loss) on marketable securities 86       86  
Equity-based compensation expense 10,621   10,621      
Common shares issued upon vesting of share-based awards (in shares)   1,018,000        
Common shares issued upon vesting of share-based awards $ 0 $ 12 (12)      
Common shares issued for employee stock purchase plan (“ESPP”) (in shares) 232,592 233,000        
Common shares issued for employee stock purchase plan (“ESPP”) $ 1,315 $ 3 1,312      
Treasury shares withheld (in shares)   (250,000)        
Treasury shares withheld (1,636)         (1,636)
Ending balance (in shares) at Dec. 31, 2018   224,290,000        
Ending balance at Dec. 31, 2018 1,034,772 $ 2,829 1,062,794 16,860 (32,338) (15,373)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (235,329)     (235,329)    
Foreign currency translation adjustments 404       404  
Unrealized gain (loss) on marketable securities 0     (1,636) 1,636  
Equity-based compensation expense 11,280   11,280      
Common shares issued upon vesting of share-based awards (in shares)   1,134,000        
Common shares issued upon vesting of share-based awards $ 0 $ 13 (13)      
Common shares issued for employee stock purchase plan (“ESPP”) (in shares) 389,284 389,000        
Common shares issued for employee stock purchase plan (“ESPP”) $ 1,752 $ 4 1,748      
Treasury shares withheld (in shares)   (302,000)        
Treasury shares withheld (1,885)         (1,885)
Ending balance (in shares) at Dec. 31, 2019   225,511,000        
Ending balance at Dec. 31, 2019 $ 810,294 $ 2,846 $ 1,075,809 $ (220,805) $ (30,298) $ (17,258)