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Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     $ 1,023,976  
Proceeds from exercise of stock options, value     6,384  
Proceeds from exercise of stock options, shares     338,000  
Tax benefit related to equity compensation     1,498  
Stock-based compensation expense     885  
Amortization of restricted stock     5,378  
Restricted stock granted, value     0  
Restricted stock canceled     0  
Dividends paid     (124,084)  
Re-issuance of treasury shares (ESPP), value     185  
Issuance of common stock (ESPP), value     92  
Net income 38,965 29,909 105,859 87,566
Other comprehensive loss (7,983) 648 (6,301) (5,791)
Ending Balance 1,066,752   1,066,752  
Common shares
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     866  
Beginning Balance, shares     72,082,000  
Proceeds from exercise of stock options, value     3  
Proceeds from exercise of stock options, shares     338,000  
Restricted stock granted, value     3  
Restricted stock granted, shares     310,000  
Restricted stock canceled (shares)     (22,000)  
Restricted stock canceled     0  
Issuance of common stock (prospectus supplement), value     15  
Issuance of common stock (prospectus supplement), shares     1,483,000  
Shares withheld for net settlement of share-based awards (shares)     (54,000)  
Re-issuance of treasury shares (ESPP), shares     5,000  
Issuance of common stock (ESPP), shares     3,000  
Retirement of treasury shares, shares     0  
Retirement of treasury shares, value     (146)  
Ending Balance 741   741  
Ending Balance, shares 74,145,000   74,145,000  
Additional Paid-In Capital
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     848,018  
Proceeds from exercise of stock options, value     6,381  
Tax benefit related to equity compensation     1,498  
Stock-based compensation expense     885  
Amortization of restricted stock     5,378  
Restricted stock granted, value     (3)  
Issuance of common stock (prospectus supplement), value     54,709  
Shares withheld for net settlements of share-based awards     (428)  
Re-issuance of treasury shares (ESPP), value     162  
Issuance of common stock (ESPP), value     92  
Retirement of treasury shares, value     (54,826)  
Ending Balance 861,866   861,866  
Earnings in Excess of Distributions
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     232,646  
Dividends paid     (124,084)  
Re-issuance of treasury shares (ESPP), value         
Retirement of treasury shares, value         
Net income     105,879  
Other comprehensive loss     0  
Ending Balance 214,441   214,441  
Accumulated Other Comprehensive Income (Loss)
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     (4,429)  
Other comprehensive loss     (6,270)  
Ending Balance (10,699)   (10,699)  
Treasury shares
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     (53,579)  
Beginning Balance, shares     14,581,000  
Shares withheld for net settlement of share-based awards (shares)     (43,000)  
Shares withheld for net settlements of share-based awards     (1,416)  
Re-issuance of treasury shares (ESPP), value     23  
Re-issuance of treasury shares (ESPP), shares     (6,000)  
Retirement of treasury shares, shares     (14,618,000)  
Retirement of treasury shares, value     54,972  
Ending Balance 0   0  
Ending Balance, shares 0   0  
Noncontrolling Interests
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     454  
Net income     (20)  
Other comprehensive loss     (31)  
Ending Balance 403   403  
Stockholders' Equity, Total
        
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests        
Beginning Balance     1,023,976  
Issuance of common stock (prospectus supplement), value     54,724  
Shares withheld for net settlements of share-based awards     (1,844)  
Retirement of treasury shares, value     $ 0