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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted shares, performance-based restricted share units and performance share unit activity
The following table presents activity for non-vested RSUs, performance-based RSUs and performance share units under the Plan in 2016.

Number of Awards

Weighted-Average Grant Date Fair Value
Balance as of January 1, 2016
735,263


$
36.53

Awards granted
2,545,624


32.27

Awards vested
(371,443
)

33.33

Awards forfeited, canceled or expired
(186,932
)

32.80

Performance-based adjustment
(590,730
)

33.10

Balance as of December 31, 2016
2,131,782


$
33.28