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Share and Unit-Based Plans: (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Feb. 28, 2009
employee
Jun. 30, 2011
employee
Dec. 31, 2011
employee
Dec. 31, 2010
Dec. 31, 2009
Feb. 25, 2009
employee
Dec. 31, 2011
2003 Equity Incentive Plan
Feb. 28, 2011
LTIP Units
employee
Dec. 31, 2011
LTIP Units
Dec. 31, 2010
LTIP Units
Dec. 31, 2009
LTIP Units
Mar. 26, 2010
LTIP Units
award
Dec. 31, 2011
Stock awards
award
Dec. 31, 2010
Stock awards
Dec. 31, 2009
Stock awards
Sep. 14, 2010
Stock awards
award
Dec. 31, 2011
Stock units
award
Dec. 31, 2010
Stock units
Dec. 31, 2009
Stock units
Sep. 14, 2010
Stock units
award
Mar. 26, 2010
Stock units
award
Dec. 31, 2011
Stock awards and units
Dec. 31, 2010
Stock awards and units
Dec. 31, 2009
Stock awards and units
Dec. 31, 2011
Stock options
Y
Dec. 31, 2010
Stock options
Dec. 31, 2009
Stock options
Dec. 31, 2011
Stock appreciation rights ("SARs")
Y
award
Dec. 31, 2010
Stock appreciation rights ("SARs")
Dec. 31, 2009
Stock appreciation rights ("SARs")
Dec. 31, 2008
Stock appreciation rights ("SARs")
Y
Sep. 14, 2010
Stock appreciation rights ("SARs")
award
Dec. 31, 2011
Director's Phantom Stock Plan
Y
Dec. 31, 2011
Phantom stock units
Dec. 31, 2010
Phantom stock units
Dec. 31, 2009
Phantom stock units
Dec. 31, 2011
Employee Stock Purchase Plan
Dec. 31, 2011
Other Share-Based Plans
Y
Share and unit-based plans                                                                            
Tenure of award (in years)             P10Y                                         P10Y                    
Maximum shares authorized under plan             13,825,428                                                   500,000       750,000  
Shares available for issuance under plan             7,827,542                                                   265,856       607,809  
Number of executives receiving grants               4                                                            
Number of common shares into which units can be converted (in shares)                 1               1                               1          
Number of awards with modified terms due to separation agreement                       5,109 2,281     2,385 61,570     37,242 83,794             43,204       43,204            
Additional compensation cost from modified terms of awards due to employee separations $ (487,000)   $ 3,333,000 $ 5,281,000                                                                    
Compensation cost under share and unit-based plans     18,836,000 27,545,000 17,963,000       8,955,000 12,780,000 3,800,000   749,000 3,086,000 6,964,000   7,526,000 8,048,000 3,291,000             402,000 596,000 626,000 2,318,000 2,669,000       980,000 911,000 643,000    
Capitalized share and unit-based compensation costs     6,231,000 12,713,000 9,868,000                                                                  
Deferral period for grant of units (in years)                                                                 3          
Service period for amortization of value of units (in years)                                                                 3          
Number of employees reduced 142 3 6                                                                      
Total number of regular and temporary employees           2,845                                                                
Non-vested share and unit based plans, quantity                                                                            
Balance at the beginning of the period (in shares)                 272,226 252,940 299,350   63,351 126,137 275,181   1,038,549 1,567,597                               29,783   3,209    
Balance at the beginning of the period (in shares)                                                       1,242,314 1,324,700 1,326,792                
Granted (in shares)               190,000 422,631 232,632     11,350 11,664 6,500   64,463   1,600,002                     31,323       10,534 54,602 25,036    
Vested (in shares)                 (504,857) (213,346) (46,410)   (53,571) (74,143) (155,077)   (519,272) (529,048) (32,405)                             (24,572) (24,819) (28,245)    
Forfeited (in shares)                           (307) (467)   (7,400)                     (85,329) (82,386) (33,415)                
Balance at the end of the period (in shares)                 190,000 272,226 252,940   21,130 63,351 126,137   576,340 1,038,549 1,567,597                             15,745 29,783      
Balance at the end of the period (in shares)                 190,000                                     1,156,985 1,242,314 1,324,700 1,326,792              
Non-vested share and unit based plans, weighted average exercise price                                                                            
Balance at the beginning of the period (in dollars per share)                 $ 50.68 $ 55.50 $ 57.02   $ 53.69 $ 69.53 $ 74.68   $ 7.17 $ 7.17                               $ 34.18   $ 83.88    
Balance at the beginning of the period (in dollars per share)                                                       $ 56.56 $ 56.56 $ 56.63                
Granted (in dollars per share)               $ 43.30 $ 46.48 $ 48.89     $ 48.47 $ 38.58 $ 8.21   $ 48.36   $ 7.17                     $ 53.72       $ 48.51 $ 35.33 $ 14.99    
Vested (in dollars per share)                 $ 49.85 $ 54.45 $ 65.29   $ 57.36 $ 78.48 $ 76.09   $ 7.17 $ 7.17 $ 7.17                             $ 39.89 $ 36.72 $ 22.82    
Forfeited (in dollars per share)                           $ 61.17 $ 70.19   $ 12.35                     $ 56.63 $ 56.63 $ 56.63                
Balance at the end of the period (in dollars per share)                 $ 43.30 $ 50.68 $ 55.50   $ 40.68 $ 53.69 $ 69.53   $ 11.71 $ 7.17 $ 7.17                             $ 34.84 $ 34.18      
Balance at the end of the period (in dollars per share)                 $ 43.30                                     $ 56.55 $ 56.56 $ 56.56 $ 56.63              
Options                                                                            
Balance at beginning of period (in shares)                                                 110,711 110,711 110,711                     10,800
Forfeited (in shares)                                                 (108,011)                          
Balance at end of period (in shares)                                                 2,700 110,711 110,711                     10,800
Weighted Average Exercise Price                                                                            
Balance at beginning of period (in dollars per share)                                                 $ 75.08 $ 75.08 $ 75.08                      
Forfeited                                                 $ 76.05                          
Balance at end of period (in dollars per share)                                                   $ 75.08 $ 75.08                      
Share and unit-based plans, additional information                                                                            
Unrecognized compensation cost of share and unit-based plans                 755,000       565,000       1,986,000                                 549,000        
Discount on purchase price (as a percent)                                                                         10.00%  
Fair value assumptions                                                                            
Volatility rate (as a percent)                                                             22.52%              
Dividend yield (as a percent)                                                             5.23%              
Risk free rate (as a percent)                                                             3.15%              
Current value (in dollars per share)                                                             $ 61.17              
Expected term (in years)                                                             8              
Treasury bond, duration (in years)                                                       10                    
The stock price that must be exceeded in estimating fair value assumption (in dollars per share)                 $ 0                                                          
Maximum shares authorized for purchase             13,825,428                                                   500,000       750,000  
Number of shares available for future purchase             7,827,542                                                   265,856       607,809  
Weighted average price of outstanding stock options exercisable (in dollars per share)                                                                           $ 26.60
Fair value of equity-based awards vested during period                                           $ 27,160,000 $ 23,469,000 $ 2,217,000                            
Weighted average remaining contractual life for the stock options                                                 1.5                         1