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Shareholders' Equity - Changes in Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Beginning Balance $ 1,039,904 $ 1,198,919  
Proceeds from exercise of stock options $ 333 261  
Proceeds from exercise of stock options (shares) 22    
Stock-based compensation expense $ 6,727 5,827  
Restricted stock granted 0    
Restricted stock canceled 0 0  
Dividends paid (57,945) (58,319)  
Shares withheld for net settlements of share-based awards (4,172) (4,357)  
Issuance of common stock - ESPP 124 141  
Repurchases of common stock   (40,182)  
Transition adjustment for accounting standard adoption     $ 0
Net income (loss) 40,649 34,920  
Other comprehensive income 2,252 1,362  
Ending Balance 1,026,904 1,138,572  
Common shares      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Beginning Balance $ 1,248 $ 1,240  
Beginning Balance, shares 120,585 124,008  
Proceeds from exercise of stock options $ 0 $ 1  
Proceeds from exercise of stock options (shares) 22 15  
Restricted stock granted $ 8    
Restricted stock granted (shares) 778    
Restricted stock canceled $ 0 $ 0  
Restricted stock canceled (shares) (6) (9)  
Shares withheld for net settlements of share-based awards $ (2) $ (2)  
Shares withheld for net settlements of share-based awards (shares) (198) (169)  
Repurchases of common stock (shares)   (1,848)  
Issuance of common stock - ESPP (shares) 6 8  
Ending Balance $ 1,254 $ 1,239  
Ending Balance, shares 121,187 122,005  
Additional Paid-In Capital      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Beginning Balance $ 1,210,916 $ 1,190,906  
Proceeds from exercise of stock options 333 260  
Stock-based compensation expense 6,727 5,827  
Restricted stock granted (8)    
Shares withheld for net settlements of share-based awards (4,170) (4,355)  
Issuance of common stock - ESPP 124 141  
Ending Balance 1,213,922 1,192,779  
Earnings in Excess of Distributions      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Beginning Balance (52,868) 31,541  
Dividends paid (57,945) (58,319)  
Transition adjustment for accounting standard adoption     (968)
Net income (loss) 40,705 34,987  
Ending Balance (71,076) 8,209  
Accumulated Other Comprehensive Loss      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Beginning Balance (23,618) (24,446)  
Transition adjustment for accounting standard adoption     $ 968
Other comprehensive income   1,354  
Ending Balance (21,366) (23,092)  
Treasury shares      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Beginning Balance $ (95,175) $ 0  
Beginning Balance, shares 4,210 0  
Repurchases of common stock (shares)   1,848  
Repurchases of common stock   $ (40,182)  
Ending Balance $ (95,175) $ (40,182)  
Ending Balance, shares 4,210 1,848  
Noncontrolling Interests      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Beginning Balance $ (599) $ (322)  
Net income (loss) (56) (67)  
Other comprehensive income   8  
Ending Balance (655) $ (381)  
Accounting Standards Update 2016-02      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Other comprehensive income 1,284    
Accounting Standards Update 2016-02 | Accumulated Other Comprehensive Loss      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Other comprehensive income 1,284    
Accounting Standards Update 2016-02 | Noncontrolling Interests      
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests      
Other comprehensive income $ 0