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Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests    
Beginning Balance $ 1,006,837  
Proceeds from exercise of stock options, value $ 979  
Proceeds from exercise of stock options, shares 50  
Tax deficiency related to equity compensation $ (818)  
Stock-based compensation expense 3,241  
Restricted stock granted, value 0  
Restricted stock canceled 0  
Dividends paid (48,507)  
Shares withheld for net settlements of share-based awards (1,717)  
Other adjustments to additional paid-in-capital 179  
Issuance of common stock (ESPP), value 107  
Net income 32,326 $ 28,756
Other comprehensive (loss) income (898) $ (5,721)
Ending Balance 991,729  
Common shares    
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests    
Beginning Balance $ 747  
Beginning Balance, shares 74,643  
Proceeds from exercise of stock options, value $ 0  
Proceeds from exercise of stock options, shares 50  
Restricted stock granted, value $ 3  
Restricted stock granted, shares 344  
Restricted stock canceled $ 0  
Restricted stock canceled (shares) (37)  
Shares withheld for net settlements of share-based awards (shares) (57)  
Issuance of common stock (ESPP), shares 4  
Ending Balance $ 750  
Ending Balance, shares 74,947  
Additional Paid-In Capital    
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests    
Beginning Balance $ 879,599  
Proceeds from exercise of stock options, value 979  
Tax deficiency related to equity compensation (818)  
Stock-based compensation expense 3,241  
Restricted stock granted, value (3)  
Shares withheld for net settlements of share-based awards (1,717)  
Other adjustments to additional paid-in-capital 179  
Issuance of common stock (ESPP), value 107  
Ending Balance 881,567  
Earnings in Excess of Distributions    
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests    
Beginning Balance 158,796  
Dividends paid (48,507)  
Net income 32,350  
Other comprehensive (loss) income 0  
Ending Balance 142,639  
Accumulated Other Comprehensive Loss    
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests    
Beginning Balance (32,404)  
Other comprehensive (loss) income (906)  
Ending Balance (33,310)  
Noncontrolling Interests    
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests    
Beginning Balance 99  
Net income (24)  
Other comprehensive (loss) income 8  
Ending Balance $ 83