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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
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 2015.

Number of Awards

Weighted-Average Grant Date Fair Value
Balance as of January 1, 2015
914,181


$
32.76

Awards granted
301,057


41.04

Awards vested
(429,352
)

29.54

Awards forfeited, canceled or expired
(6,546
)

37.53

Performance-based adjustment
(44,077
)

37.47

Balance as of December 31, 2015
735,263


$
36.53