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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 (26,663)     (26,663)    
Foreign currency translation adjustments 483       483  
Change in marketable securities (318)       (318)  
Equity-based compensation expense 5,701   5,701      
Common stock dividends (16,703)     (16,703)    
Common shares issued upon vesting of share-based awards (in shares)   471        
Common shares issued upon vesting of share-based awards 0 $ 5 (5)      
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 withheld (in shares)   (147)        
Treasury shares withheld (1,794)         (1,794)
Balance at end of period (in shares) at Mar. 31, 2017   222,776        
Balance at end of period at Mar. 31, 2017 1,272,543 $ 2,808 1,042,976 273,904 (32,812) (14,333)
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 (42,073)     (42,073)    
Foreign currency translation adjustments 87       87  
Change in marketable securities (85)       (85)  
Equity-based compensation expense 2,280   2,280      
Common shares issued upon vesting of share-based awards (in shares)   601        
Common shares issued upon vesting of share-based awards 0 $ 8 (8)      
Common shares issued for employee stock purchase plan (ESPP) (in shares)   99        
Common shares issued for employee stock purchase plan (ESPP) 561 $ 1 560      
Treasury shares withheld (in shares)   (167)        
Treasury shares withheld (1,035)         (1,035)
Balance at end of period (in shares) at Mar. 31, 2018   223,822        
Balance at end of period at Mar. 31, 2018 $ 1,076,306 $ 2,823 $ 1,053,705 $ 65,520 $ (30,970) $ (14,772)