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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 3 Months Ended 6 Months Ended 0 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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
LTIP Units
Jun. 30, 2012
LTIP Units
Jun. 30, 2013
LTIP Units
Jun. 30, 2012
LTIP Units
Feb. 15, 2013
LTIP Units
Executive officers
employee
Jun. 30, 2013
Stock awards
Jun. 30, 2012
Stock awards
Jun. 30, 2013
Stock awards
Jun. 30, 2012
Stock awards
Jun. 30, 2013
Stock units
Jun. 30, 2012
Stock units
Jun. 30, 2013
Stock units
Jun. 30, 2012
Stock units
Jun. 30, 2013
Stock options
Jun. 30, 2013
Stock options
Jun. 30, 2012
Stock appreciation rights ("SARs")
Jun. 30, 2013
Stock appreciation rights ("SARs")
Jun. 30, 2012
Stock appreciation rights ("SARs")
Jun. 30, 2013
Phantom stock units
Jun. 30, 2012
Phantom stock units
Jun. 30, 2013
Phantom stock units
Jun. 30, 2012
Phantom stock units
Share and unit-based plans                                                    
Number of executives receiving grants                 7                                  
Number of common shares into which units can be converted             1                                      
Look-back period             1 year                                      
Compensation cost under share and unit-based plans $ 5,731 $ 3,165 $ 10,868 $ 7,282 $ 4,692 $ 2,321 $ 7,650 $ 3,868   $ 122 $ 124 $ 232 $ 220 $ 667 $ 383 $ 2,491 $ 2,603 $ 4 $ 8 $ 82   $ 82 $ 246 $ 255 $ 487 $ 509
Capitalized share and unit-based compensation costs 650 452 2,088 1,772                                            
Share and unit-based plans, additional information                                                    
Unrecognized compensation cost of share and unit-based plans         $ 9,487   $ 9,487     $ 913   $ 913   $ 4,324   $ 4,324   $ 68 $ 68       $ 1,188   $ 1,188  
Award activity, Shares or Units                                                    
Balance at the beginning of the period (in shares)             200,000         20,924       114,677                    
Balance at the beginning of the period (in shares)                                     12,768   1,164,185          
Granted (in shares)             332,189   332,189     8,963       67,920                 28,446  
Vested (in shares)             (200,000)         (10,886)       (45,279)                 (8,081)  
Exercised (in shares)                                         (93,194)          
Balance at the end of the period (in shares)         332,189   332,189     19,001   19,001   137,318   137,318             20,365   20,365  
Balance at the end of the period (in shares)                                   12,768 12,768   1,070,991          
Award activity, Weighted Average Grant Date Fair Value                                                    
Balance at the beginning of the period (in dollars per share)             $ 38.63         $ 49.36       $ 52.19                    
Balance at the beginning of the period (in dollars per share)                                     $ 54.69   $ 56.66          
Granted (in dollars per share)             $ 49.67   $ 49.67     $ 61.84       $ 62.01                 $ 58.92  
Vested (in dollars per share)             $ 38.63         $ 46.70       $ 51.29                 $ 60.35  
Exercised (in dollars per share)                                         $ 56.63          
Balance at the end of the period (in dollars per share)         $ 49.67   $ 49.67     $ 56.77   $ 56.77   $ 57.24   $ 57.24             $ 58.36   $ 58.36  
Balance at the end of the period (in dollars per share)                                   $ 54.69 $ 54.69   $ 56.66