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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2016   222,401        
Balance at beginning of period at Dec. 31, 2016 $ 1,311,319 $ 2,802 $ 1,036,786 $ 317,270 $ (32,977) $ (12,562)
Increase (Decrease) in Stockholders' Equity            
Net loss (50,317)     (50,317)    
Foreign currency translation adjustments 2,809       2,809  
Change in marketable securities (342)       (342)  
Equity-based compensation expense 11,458   11,458      
Common stock dividends (50,424)     (50,424)    
Common shares issued upon vesting of share-based awards (in shares)   694        
Common shares issued upon vesting of share-based awards 0 $ 7 (7)      
Common shares issued for employee stock purchase plan (ESPP) (in shares)   50        
Common shares issued for employee stock purchase plan (“ESPP”) 512 $ 1 511      
Treasury shares issued upon vesting of share-based awards (in shares)   4        
Treasury shares issued upon vesting of share-based awards (18)   (84)     66
Treasury shares issued for ESPP (in shares)   106        
Treasury shares issued for ESPP 740 $ 0 (166) (736)   1,642
Treasury shares withheld (in shares)   (193)        
Treasury shares withheld (2,254)         (2,254)
Balance at end of period (in shares) at Sep. 30, 2017   223,062        
Balance at end of period at Sep. 30, 2017 1,223,483 $ 2,810 1,048,498 215,793 (30,510) (13,108)
Increase (Decrease) in Stockholders' Equity            
Cumulative effect of accounting change 670     670    
Balance at beginning of period (in shares) at Dec. 31, 2017   223,289        
Balance at beginning of period at Dec. 31, 2017 1,115,901 $ 2,814 1,050,873 106,923 (30,972) (13,737)
Increase (Decrease) in Stockholders' Equity            
Net loss (74,835)     (74,835)    
Foreign currency translation adjustments (653)       (653)  
Change in marketable securities 110       110  
Equity-based compensation expense 8,176   8,176      
Common shares issued upon vesting of share-based awards (in shares)   938        
Common shares issued upon vesting of share-based awards 0 $ 11 (11)      
Common shares issued for employee stock purchase plan (ESPP) (in shares)   232        
Common shares issued for employee stock purchase plan (“ESPP”) 1,315 $ 3 1,312     0
Treasury shares withheld (in shares)   (231)        
Treasury shares withheld (1,501)         (1,501)
Balance at end of period (in shares) at Sep. 30, 2018   224,228        
Balance at end of period at Sep. 30, 2018 $ 1,049,183 $ 2,828 $ 1,060,350 $ 32,758 $ (31,515) $ (15,238)