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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Unit and Performance Share Transactions
A summary of restricted stock unit and performance share transactions for the year ended December 31, 2017, is shown below:
 
Restricted
Stock Units
Weighted Average Grant Date
Fair Value
Performance
Shares
Weighted Average Grant Date
Fair Value
Outstanding as of December 31, 2016
623,142

$92.54
1,455,054

$94.19
Granted
153,675

$142.14
389,384

$132.94
Distributed (vested)
(194,373
)
 
(571,254
)
 
Cancelled
(10,231
)
 
(73,614
)
 
Outstanding as of December 31, 2017 (1)
572,213

$109.31
1,199,570

$115.33
 
 
 
 
 
Vested or expected to vest as of December 31, 2017
572,213

 
1,150,611

 
(1)
Outstanding performance shares are reflected at the maximum possible payout that may be earned during the relevant performance periods.