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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning Balance at Dec. 31, 2014 $ 2,905,810 $ 1,893 $ 984,674 $ 2,811,815 $ 6,463 $ (899,035)
Beginning Balance (in shares) at Dec. 31, 2014   189,263,000        
Net income (loss) (294,486)     (294,486)    
Foreign currency translation adjustment (10,556)       (10,556)  
Issuance of restricted stock   $ 12 (12)      
Issuance of restricted stock (in shares)   1,180,000        
Vesting of restricted stock units (in shares)   14,000        
Forfeitures of restricted stock   $ (1) 1      
Forfeitures of restricted stock (in shares)   (82,000)        
Stock-based compensation 28,510   28,510      
Tax expense related to stock-based compensation (1,362)   (1,362)      
Payment of cash dividends (58,775)     (58,775)    
Purchase of treasury stock (8,010)         (8,010)
Ending Balance at Dec. 31, 2015 2,561,131 $ 1,904 1,011,811 2,458,554 (4,093) (907,045)
Ending Balance (in shares) at Dec. 31, 2015   190,375,000        
Net income (loss) (318,634)     (318,634)    
Foreign currency translation adjustment 2,959       2,959  
Shares issued for acquisitions 6,733 $ 3 6,730      
Shares issued for acquisitions (in shares)   354,000        
Issuance of restricted stock   $ 8 (8)      
Issuance of restricted stock (in shares)   785,000        
Vesting of restricted stock units (in shares)   15,000        
Forfeitures of restricted stock (in shares)   (43,000)        
Exercise of stock options 707   707      
Exercise of stock options (in shares)   40,000        
Stock-based compensation 28,324   28,324      
Tax expense related to stock-based compensation (4,868)   (4,868)      
Payment of cash dividends (23,579)     (23,579)    
Purchase of treasury stock (4,049)         (4,049)
Ending Balance at Dec. 31, 2016 $ 2,248,724 $ 1,915 1,042,696 2,116,341 (1,134) (911,094)
Ending Balance (in shares) at Dec. 31, 2016 191,525,872 191,526,000        
Net income (loss) $ 5,910     5,910    
Foreign currency translation adjustment 7,956       7,956  
Equity offering 471,570 $ 182 471,388      
Equity offering (in shares)   18,170,000        
Shares issued for acquisitions 1,226,890 $ 551 1,226,339      
Shares issued for acquisitions (in shares)   55,097,000        
Issuance of restricted stock   $ 9 (9)      
Issuance of restricted stock (in shares)   891,000        
Vesting of restricted stock units   $ 5 (5)      
Vesting of restricted stock units (in shares)   549,000        
Forfeitures of restricted stock (in shares)   (24,000)        
Exercise of stock options $ 931   931      
Exercise of stock options (in shares) 50,000 50,000        
Stock-based compensation $ 44,483   44,483      
Payment of cash dividends (16,315)     (16,315)    
Dividend equivalents (39)     (39)    
Purchase of treasury stock (7,617)         (7,617)
Ending Balance at Dec. 31, 2017 $ 3,982,493 $ 2,662 $ 2,785,823 $ 2,105,897 $ 6,822 $ (918,711)
Ending Balance (in shares) at Dec. 31, 2017 266,259,083 266,259,000