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Shareholders' Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 13, 2017
Mar. 07, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests            
Beginning Balance         $ 974,957  
Proceeds from exercise of stock options, value         $ 6,786  
Proceeds from exercise of stock options (shares)         348,000  
Stock-based compensation expense         $ 14,852  
Restricted stock granted, value         0  
Restricted stock canceled         0  
Dividends paid         (169,152)  
Issuance of common stock - prospectus supplement         275,867  
Issuance of common stock - prospectus supplement (shares) 10,350,000 9,000,000        
Shares withheld for net settlements of share-based awards         (4,122)  
Issuance of common stock - ESPP         382  
Net income     $ 38,453 $ 43,674 109,761 $ 99,156
Other comprehensive income     1,625 $ 483 4,761 $ (2,983)
Ending Balance     1,214,092   1,214,092  
Common shares            
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests            
Beginning Balance         $ 1,125  
Beginning Balance, shares         112,548,000  
Proceeds from exercise of stock options, value         $ 3  
Proceeds from exercise of stock options (shares)         348,000  
Restricted stock granted, value         $ 9  
Restricted stock granted (shares)         927,000  
Restricted stock canceled (shares)         (60,000)  
Issuance of common stock - prospectus supplement         $ 104  
Issuance of common stock - prospectus supplement (shares)         10,350,000  
Shares withheld for net settlements of share-based awards         $ (1)  
Shares withheld for net settlements of share-based awards (shares)         (135,000)  
Re-issuance of treasury shares - ESPP (shares)         13,000  
Ending Balance     $ 1,240   $ 1,240  
Ending Balance, shares     123,991,000   123,991,000  
Additional Paid-In Capital            
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests            
Beginning Balance         $ 891,993  
Proceeds from exercise of stock options, value         6,783  
Stock-based compensation expense         14,852  
Restricted stock granted, value         (9)  
Issuance of common stock - prospectus supplement         275,763  
Shares withheld for net settlements of share-based awards         (4,121)  
Issuance of common stock - ESPP         382  
Ending Balance     $ 1,185,643   1,185,643  
Earnings in Excess of Distributions            
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests            
Beginning Balance         112,763  
Dividends paid         (169,152)  
Net income         109,884  
Ending Balance     53,495   53,495  
Accumulated Other Comprehensive Loss            
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests            
Beginning Balance         (30,825)  
Other comprehensive income         4,757  
Ending Balance     (26,068)   (26,068)  
Noncontrolling Interests            
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests            
Beginning Balance         (99)  
Net income         (123)  
Other comprehensive income         4  
Ending Balance     $ (218)   $ (218)