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Share and Unit-Based Plans: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Apr. 30, 2012
LTIP Units
Feb. 29, 2012
LTIP Units
employee
Jan. 31, 2012
LTIP Units
Jun. 30, 2012
LTIP Units
Jun. 30, 2011
LTIP Units
Jun. 30, 2012
LTIP Units
year
Jun. 30, 2011
LTIP Units
Jun. 30, 2012
Stock awards
Jun. 30, 2011
Stock awards
Jun. 30, 2012
Stock awards
Jun. 30, 2011
Stock awards
Jun. 30, 2012
Stock units
Jun. 30, 2011
Stock units
Jun. 30, 2012
Stock units
Jun. 30, 2011
Stock units
Jun. 30, 2012
Stock options
Dec. 31, 2011
Stock options
Jun. 30, 2012
Stock appreciation rights ("SARs")
Jun. 30, 2011
Stock appreciation rights ("SARs")
Jun. 30, 2012
Stock appreciation rights ("SARs")
Jun. 30, 2011
Stock appreciation rights ("SARs")
Jun. 30, 2012
Phantom stock units
Jun. 30, 2011
Phantom stock units
Jun. 30, 2012
Phantom stock units
Jun. 30, 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           1                                              
Look-back period (in years)                   0.92                                      
Compensation cost under share and unit-based plans $ 3,165 $ 6,133 $ 7,282 $ 11,902       $ 2,321 $ 2,575 $ 3,868 $ 4,477 $ 124 $ 84 $ 220 $ 578 $ 383 $ 2,930 $ 2,603 $ 5,742     $ 82 $ 302 $ 82 $ 623 $ 255 $ 242 $ 509 $ 482
Capitalized share and unit-based compensation costs 452 2,098 1,772 5,012                                                  
Share and unit-based plans, additional information                                                          
Unrecognized compensation cost of share and unit-based plans               $ 5,014   $ 5,014   $ 870   $ 870   $ 3,327   $ 3,327       $ 115   $ 115   $ 275   $ 275  
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          
Granted (in shares)         10,000 190,000 95,000     295,000       9,639       72,322                   4,200  
Vested (in shares)                   (285,000)       (9,845)       (533,985)                   (12,065)  
Exercised (in shares)                                               (32,732)          
Balance at the end of the period (in shares)               200,000   200,000   20,924   20,924   114,677   114,677               7,880   7,880  
Balance at the end of the period (in shares)                                           1,124,253   1,124,253          
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          
Granted (in dollars per share)         $ 54.97 $ 37.77       $ 40.13       $ 54.43       $ 54.43                   $ 56.09  
Vested (in dollars per share)                   $ 43.30       $ 35.69       $ 15.24                   $ 42.23  
Exercised (in dollars per share)                                               $ 56.63          
Balance at the end of the period (in dollars per share)               $ 38.63   $ 38.63   $ 49.36   $ 49.36   $ 52.19   $ 52.19               $ 34.84   $ 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