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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Parent [Member]
Noncontrolling Interest [Member]
Beginning Balance, Shares, Outstanding at Dec. 31, 2014     701,408,060            
Beginning Balance, Equity at Dec. 31, 2014 $ 764,944   $ 70 $ 1,847,420   $ (921,960) $ 35,763 $ 762,826 $ 2,118
Beginning Balance, Treasury Stock, Shares at Dec. 31, 2014         27,239,104        
Beginning Balance, Treasury Stock, Value at Dec. 31, 2014         $ (198,467)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss 33,679         20,668   20,668 13,011
Foreign currency translation adjustments (15,497)           (15,497) (15,497) 0
Pension liability adjustment 113           (13) (13)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (13)                
Unrealized gain (loss) on available-for-sale debt security, net of tax (41)           (41) (41)  
Exercise of stock options, shares     673,608            
Exercise of stock options, value 951   $ 0 951       951  
Vesting of restricted stock units, shares     21,306,534            
Vesting of restricted stock units, value     $ 3 (3)          
Shares issued under employee stock purchase plan, shares     1,037,198            
Shares issued under employee stock purchase plan, value 4,857     4,857       4,857  
Tax withholding related to net share settlements of stock-based compensation awards, shares     (6,841,839)            
Tax withholding related to net share settlements of stock-based compensation awards, value (40,819)   $ 1 (40,818)       (40,819)  
Stock-based compensation on equity-classified awards 156,386     156,386       156,386  
Excess tax benefits on stock-based compensation awards (4,340)     4,340       4,340  
Purchases of treasury stock, shares         (101,229,061)        
Purchases of treasury stock, value (446,574)       $ (446,574)     (446,574)  
Partnership distributions to noncontrolling interest holders (13,940)               (13,940)
Ending Balance, Treasury Stock, Shares at Dec. 31, 2015         128,468,165        
Ending Balance, Treasury Stock, Value at Dec. 31, 2015         $ (645,041)        
Ending Balance, Shares, Outstanding at Dec. 31, 2015     719,787,422            
Ending Balance, Equity at Dec. 31, 2015 470,587   $ 72 1,964,453   (901,292) 51,206 469,398 1,189
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Net loss 20,668                
Foreign currency translation 15,497           15,497 15,497 0
Cumulative Effect on Retained Earnings, Net of Tax           3,131      
Net loss (183,323)         (194,587)   (194,587) 11,264
Foreign currency translation adjustments (5,988)           (5,988) (5,988) 0
Pension liability adjustment (830)           928 928  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 928                
Unrealized gain (loss) on available-for-sale debt security, net of tax $ (70)           (70) (70)  
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (196,968)                
Exercise of stock options, shares     491,483            
Exercise of stock options, value $ 620     620       620  
Vesting of restricted stock units, shares     22,698,324            
Vesting of restricted stock units, value     $ 3 (3)          
Shares issued under employee stock purchase plan, shares     1,669,782            
Shares issued under employee stock purchase plan, value 4,358     4,358       4,358  
Tax withholding related to net share settlements of stock-based compensation awards, shares     (7,918,272)            
Tax withholding related to net share settlements of stock-based compensation awards, value (31,161)   $ (1) (31,160)       (31,161)  
Stock-based compensation on equity-classified awards 131,114     131,114       131,114  
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 67,014             67,014  
Purchase of Convertible Note Hedges (59,163)             (59,163)  
Adjustments to Additional Paid in Capital, Warrant Issued 35,495             35,495  
Purchases of treasury stock, shares         (43,227,743)        
Purchases of treasury stock, value (162,383)       $ (162,383)     (162,383)  
Partnership distributions to noncontrolling interest holders (11,811)               (11,811)
Ending Balance, Treasury Stock, Shares at Dec. 31, 2016         (171,695,908)        
Ending Balance, Treasury Stock, Value at Dec. 31, 2016 (807,424)       $ (807,424)        
Ending Balance, Shares, Outstanding at Dec. 31, 2016     736,531,771            
Ending Balance, Equity at Dec. 31, 2016 265,062   $ 74 2,112,728   (1,099,010) 58,052 264,420 642
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Net loss (194,587) $ (194,587)              
Foreign currency translation 5,988           5,988 5,988 0
Cumulative Effect on Retained Earnings, Net of Tax (3,234)         3,234   (3,234)  
Net loss 26,627         14,040     12,587
Foreign currency translation adjustments 27,287           27,287 27,287 0
Pension liability adjustment 0           585 585 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 585                
Unrealized gain (loss) on available-for-sale debt security, net of tax 494           494 494  
Exercise of stock options, shares     102,803            
Exercise of stock options, value 230     230       230  
Vesting of restricted stock units, shares     16,596,562            
Vesting of restricted stock units, value     $ 2 (2)          
Shares issued under employee stock purchase plan, shares     1,879,656            
Shares issued under employee stock purchase plan, value 5,283     5,283       5,283  
Tax withholding related to net share settlements of stock-based compensation awards, shares     (6,568,930)            
Tax withholding related to net share settlements of stock-based compensation awards, value (27,188)   $ (1) (27,187)       (27,188)  
Stock-based compensation on equity-classified awards 83,656     83,656       83,656  
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt       67,014          
Purchases of treasury stock, shares         (16,906,334)        
Purchases of treasury stock, value (60,026)       $ (60,026)     (60,026)  
Partnership distributions to noncontrolling interest holders (12,357)               (12,357)
Ending Balance, Treasury Stock, Shares at Dec. 31, 2017         (188,602,242)        
Ending Balance, Treasury Stock, Value at Dec. 31, 2017 (867,450)       $ (867,450)        
Ending Balance, Shares, Outstanding at Dec. 31, 2017     748,541,862            
Ending Balance, Equity at Dec. 31, 2017 251,845   $ 75 $ 2,174,708   $ (1,088,204) 31,844 250,973 872
Increase (Decrease) in Partners' Capital [Roll Forward]                  
Net loss               14,040  
Foreign currency translation $ (27,287)           $ (27,287) $ (27,287) $ 0