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Share-based compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation [Abstract]      
Total compensation recognized for awards, net of capitalization $ 15,552,000 $ 14,160,000 $ 11,755,000
Stock Award
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 561,068 550,763 489,010
Number of shares granted 338,915 310,240 333,479
Number of shares vested (323,594) (297,669) (269,076)
Number of shares forfeited (6,616) (2,266) (2,650)
Outstanding, ending balance (in shares) 569,773 561,068 550,763
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighed average grant date fair value per share, outstanding beginning balance $ 73.37 $ 71.04 $ 67.27
Weighed average grant date fair value per share, granted $ 63.74 $ 72.85 $ 75.32
Weighed average grant date fair value per share, vested $ 71.78 $ 68.52 $ 69.52
Weighed average grant date fair value per share, forfeited $ 72.96 $ 74.30 $ 69.03
Weighed average grant date fair value per share, outstanding ending balance $ 68.54 $ 73.37 $ 71.04
Share-based Compensation [Abstract]      
Total fair value of share awards vested 23,228,000 20,396,000 18,706,000
Total compensation recognized for awards, net of capitalization 15,552,000 14,160,000 11,755,000
Capitalized stock compensation 8,193,000 7,768,000 8,514,000
Unrecognized compensation related to nonvested share awards $ 31,200,000    
Unrecognized compensation recognition period (in years) 3 years    
Weighted average period recognition period for unrecognized compensation 12 months