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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 (52,613)     (52,613)    
Foreign currency translation adjustments 1,321       1,321  
Change in marketable securities (241)       (241)  
Equity-based compensation expense 9,116   9,116      
Common stock dividends (33,426)     (33,426)    
Common shares issued upon vesting of share-based awards (in shares)   685        
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) 526 $ 1 525      
Treasury shares issued upon vesting of share-based awards (in shares)   1        
Treasury shares issued upon vesting of share-based awards (8)   (31)     23
Treasury shares issued for ESPP (in shares)   105        
Treasury shares issued for ESPP 740 $ 1 (903)     1,642
Treasury shares withheld (in shares)   (190)        
Treasury shares withheld (2,241)         (2,241)
Balance at end of period (in shares) at Jun. 30, 2017   223,052        
Balance at end of period at Jun. 30, 2017 1,234,493 $ 2,811 1,045,486 231,231 (31,897) (13,138)
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 (67,836)     (67,836)    
Foreign currency translation adjustments (748)       (748)  
Change in marketable securities 82       82  
Equity-based compensation expense 5,168   5,168      
Common shares issued upon vesting of share-based awards (in shares)   848        
Common shares issued upon vesting of share-based awards 0 $ 10 (10)      
Common shares issued for employee stock purchase plan (ESPP) (in shares)   99        
Common shares issued for employee stock purchase plan (ESPP) 562 $ 1 561     0
Treasury shares withheld (in shares)   (198)        
Treasury shares withheld (1,217)         (1,217)
Balance at end of period (in shares) at Jun. 30, 2018   224,038        
Balance at end of period at Jun. 30, 2018 $ 1,052,582 $ 2,825 $ 1,056,592 $ 39,757 $ (31,638) $ (14,954)