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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
Noncontrolling Interest
Balance at beginning of period (in shares) at Dec. 31, 2014   154,327          
Balance at beginning of period at Dec. 31, 2014 $ 1,472,536 $ 2,033 $ 683,611 $ 545,357 $ (14,210) $ (4,801) $ 260,546
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 46,401     34,279     12,122
Foreign currency translation adjustments (11,747)       (8,749)   (2,998)
Unrealized gain on marketable securities 354       264   90
Stock-based compensation expense 8,010   8,010        
Amount withheld for employee stock purchase plan 55   55        
Distributions to noncontrolling interest (20,982)           (20,982)
Common stock dividends ($0.15 per share) (23,150)     (23,150)      
Common shares issued upon vesting of restricted stock units (in shares)   6          
Common shares issued upon vesting of restricted stock units 0 $ 0          
Treasury shares withheld (in shares)   (2)          
Treasury shares withheld (36)         (36)  
Balance at end of period (in shares) at Mar. 31, 2015   154,331          
Balance at end of period at Mar. 31, 2015 1,471,441 $ 2,033 691,676 556,486 (22,695) (4,837) 248,778
Balance at beginning of period (in shares) at Dec. 31, 2015   155,146          
Balance at beginning of period at Dec. 31, 2015 1,451,426 $ 2,045 712,486 531,621 (25,555) (9,298) 240,127
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) (2,408)     (772)     (1,636)
Foreign currency translation adjustments 2,662       1,987   675
Unrealized gain on marketable securities 191       143   48
Stock-based compensation expense 4,104   4,104        
Amount withheld for employee stock purchase plan 104   104        
Distributions to noncontrolling interest (5,012)           (5,012)
Common stock dividends ($0.15 per share) (23,300)     (23,300)      
Common shares issued upon vesting of restricted stock units (in shares)   224          
Common shares issued upon vesting of restricted stock units 0 $ 3 (3)        
Common shares issued for ESPP (in shares)   29          
Common shares issued for ESPP 388   388        
Treasury shares withheld (in shares)   (41)          
Treasury shares withheld (584)         (584)  
Balance at end of period (in shares) at Mar. 31, 2016   155,358          
Balance at end of period at Mar. 31, 2016 $ 1,427,571 $ 2,048 $ 717,079 $ 507,549 $ (23,425) $ (9,882) $ 234,202