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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015, 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, 2014 | 764,548 |  | $58.51 | 3,024,121 |  | $53.29
Granted | 206,895 |  | $104.46 | 476,826 |  | $97.92
Distributed (vested) | (247,662 | ) |  | (1,029,333 | ) |
Cancelled | (15,032 | ) |  | (241,278 | ) |
Outstanding as of December 31, 2015 (1) | 708,749 |  | $74.68 | 2,230,336 |  | $66.91
Vested or expected to vest as of December 31, 2015 | 708,749 |  |  | 1,915,340 |  |
(1) | Outstanding performance shares are reflected at the maximum possible payout that may be earned during the relevant performance periods.

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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