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Consolidated Statements of Shareholders' 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 (Shares) at Dec. 31, 2013   153,524          
Balance at beginning of period at Dec. 31, 2013 $ 1,333,327 $ 2,019 $ 642,164 $ 455,632 $ (2,383) $ 0 $ 235,895
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 110,411     77,079     33,332
Foreign currency translation adjustments 891       662   229
Unrealized gain (loss) on marketable securities, net of tax (157)       (117)   (40)
Stock-based compensation expense 20,236   20,236        
Distribution to noncontrolling interest (22,224)     0     (22,224)
Common stock dividends (23,029)   0 (23,029)      
Preferred stock dividends (1)     (1)      
Balance at end of period (Shares) at Jun. 30, 2014   153,524          
Balance at end of period at Jun. 30, 2014 1,419,454 $ 2,019 662,400 509,681 (1,838) 0 247,192
Balance at beginning of period (Shares) at Dec. 31, 2013   153,524          
Balance at beginning of period at Dec. 31, 2013 1,333,327 $ 2,019 642,164 455,632 (2,383) 0 235,895
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Preferred stock dividends (2)            
Balance at end of period (Shares) at Dec. 31, 2014   154,327          
Balance at end 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 75,254     55,109     20,145
Foreign currency translation adjustments (8,574)       (6,386)   (2,188)
Unrealized gain (loss) on marketable securities, net of tax (1,054)       (786)   (268)
Stock-based compensation expense 18,571   18,571        
Amount withheld for employee stock purchase plan 86   86        
Distribution to noncontrolling interest (32,479)           (32,479)
Common stock dividends (46,305)     (46,305)      
Preferred stock dividends (2)     (2)      
Common shares issued upon vesting of restricted stock units (Shares)   72          
Common shares issued upon vesting of restricted stock units   $ 1 (1)        
Treasury shares withheld (Shares)   (26)          
Treasury shares withheld (533)         (533)  
Balance at end of period (Shares) at Jun. 30, 2015   154,373          
Balance at end of period at Jun. 30, 2015 $ 1,477,500 $ 2,034 $ 702,267 $ 554,159 $ (21,382) $ (5,334) $ 245,756