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Share and Unit-Based Plans - Nonvested equity awards (Details)
 6 Months Ended
Jun. 30, 2018
$ / shares
shares
LTIP Units  
Units  
Balance at beginning of period (in shares) | shares 636,632
Granted (in shares) | shares 569,136.000
Vested (in shares) | shares (189,044)
Forfeited (in shares) | shares (23,666)
Balance at end of period (in shares) | shares 993,058
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 52.36
Granted (in dollars per share) | $ / shares 51.78
Vested (in dollars per share) | $ / shares 57.49
Forfeited (in dollars per share) | $ / shares 44.28
Balance at end of period (in dollars per share) | $ / shares $ 51.24
Phantom Stock Units  
Units  
Balance at beginning of period (in shares) | shares 4,054
Granted (in shares) | shares 7,337
Vested (in shares) | shares (7,761)
Forfeited (in shares) | shares (845)
Balance at end of period (in shares) | shares 2,785
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 79.82
Granted (in dollars per share) | $ / shares 63.03
Vested (in dollars per share) | $ / shares 54.70
Forfeited (in dollars per share) | $ / shares 77.91
Balance at end of period (in dollars per share) | $ / shares $ 66.79
Stock Units  
Units  
Balance at beginning of period (in shares) | shares 151,355
Granted (in shares) | shares 86,495
Vested (in shares) | shares (107,505)
Forfeited (in shares) | shares 0
Balance at end of period (in shares) | shares 130,345
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 73.32
Granted (in dollars per share) | $ / shares 59.00
Vested (in dollars per share) | $ / shares 74.43
Forfeited (in dollars per share) | $ / shares 0.00
Balance at end of period (in dollars per share) | $ / shares $ 64.24