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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 177,851     124,425     53,426
Foreign currency translation adjustments (5,369)       (3,996)   (1,373)
Unrealized gain on marketable securities (2,057)       (1,532)   (525)
Stock-based compensation expense 29,450   29,450        
Distribution to noncontrolling interest (32,470)     0     (32,470)
Common stock dividends (46,170)   0 (46,170)      
Preferred stock dividends (1)     (1)      
Common shares issued upon vesting of restricted stock units (Shares)   954          
Common shares issued upon vesting of restricted stock units   $ 13 (13)        
Treasury shares withheld (Shares)   (205)          
Treasury shares withheld (4,154)         (4,154)  
Balance at end of period (Shares) at Sep. 30, 2014   154,273          
Balance at end of period at Sep. 30, 2014 1,450,407 $ 2,032 671,601 533,886 (7,911) (4,154) 254,953
Balance at beginning of period (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 99,342     71,674     27,668
Foreign currency translation adjustments (12,287)       (9,154)   (3,133)
Unrealized gain on marketable securities (1,247)       (928)   (319)
Stock-based compensation expense 24,606   24,606        
Amount withheld for employee stock purchase plan 147   147        
Distribution to noncontrolling interest (43,539)           (43,539)
Common stock dividends (69,573)     (69,573)      
Preferred stock dividends (2)     (2)      
Common shares issued upon vesting of restricted stock units (Shares)   1,040          
Common shares issued upon vesting of restricted stock units   $ 12 (12)        
Common shares issued for ESPP (shares)   20          
Common shares issued for ESPP 290   290        
Treasury shares withheld (Shares)   (262)          
Treasury shares withheld (4,359)         (4,359)  
Balance at end of period (Shares) at Sep. 30, 2015   155,125          
Balance at end of period at Sep. 30, 2015 $ 1,465,914 $ 2,045 $ 708,642 $ 547,456 $ (24,292) $ (9,160) $ 241,223