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Share and Unit-Based Plans: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Feb. 29, 2012
LTIP Units
employee
Jan. 31, 2012
LTIP Units
Mar. 31, 2012
LTIP Units
Y
Mar. 31, 2011
LTIP Units
Mar. 31, 2012
Stock awards
Mar. 31, 2011
Stock awards
Mar. 31, 2012
Stock units
Mar. 31, 2011
Stock units
Dec. 31, 2011
Stock options
Mar. 31, 2011
Stock appreciation rights ("SARs")
Mar. 31, 2012
Stock appreciation rights ("SARs")
Dec. 31, 2011
Stock appreciation rights ("SARs")
Sep. 30, 2011
Stock appreciation rights ("SARs")
award
Mar. 31, 2012
Stock awards and units
Mar. 31, 2012
Phantom stock units
Mar. 31, 2011
Phantom stock units
Share and unit-based plans                                    
Number of executives receiving grants     4                              
Number of common shares into which units can be converted (in shares)     1                              
Look-back period (in years)         0.92                          
Number of awards with modified terms due to separation agreement                             43,204      
Compensation cost under share and unit-based plans $ 4,117 $ 5,768     $ 1,547 $ 1,901 $ 96 $ 493 $ 2,220 $ 2,813   $ 321         $ 254 $ 240
Capitalized share and unit-based compensation costs 1,319 3,081                                
Non-vested share and unit based plans, quantity                                    
Balance at the beginning of the period (in shares)       190,000 190,000   21,130   576,340               15,745  
Balance at the beginning of the period (in shares)                         1,156,985 1,156,985        
Granted (in shares)     190,000 95,000 285,000   9,639   72,322               2,134  
Vested (in shares)         (285,000)   (9,511)   (533,985)               (6,066)  
Balance at the end of the period (in shares)             21,258   114,677               11,813  
Balance at the end of the period (in shares)         190,000               1,156,985 1,156,985        
Non-vested share and unit based plans, weighted average exercise price                                    
Balance at the beginning of the period (in dollars per share)       $ 43.30 $ 43.30   $ 40.68   $ 11.71               $ 34.84  
Balance at the beginning of the period (in dollars per share)                         $ 56.55 $ 56.55        
Granted (in dollars per share)     $ 37.77   $ 39.61   $ 54.43   $ 54.43               $ 54.93  
Vested (in dollars per share)         $ 43.30   $ 35.68   $ 15.24               $ 41.90  
Balance at the end of the period (in dollars per share)         $ 37.77   $ 49.15   $ 52.19               $ 34.84  
Balance at the end of the period (in dollars per share)                         $ 56.55 $ 56.55        
Level of percentile ranking at which awards vested (as a percent)     150.00%                              
Options                                    
Balance at beginning of period (in shares)                     13,500         13,500    
Balance at end of period (in shares)                     13,500         13,500    
Weighted Average Exercise Price                                    
Balance at beginning of period (in dollars per share)                     $ 30.08         $ 30.08    
Balance at end of period (in dollars per share)                     $ 30.08         $ 30.08    
Share and unit-based plans, additional information                                    
Unrecognized compensation cost of share and unit-based plans         $ 6,384   $ 994   $ 3,762               $ 412