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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Restricted Stock Unit Activity
The following table summarizes the RSU activity for the years ended December 31, 2015, 2014 and 2013:

 
Year Ended December 31,
 
2015
 
2014
 
2013
 
Units
 
Weighted
Average
Fair Value
at Date of
Grant (a)
 
Units
 
Weighted
Average
Fair Value
at Date of
Grant (a)
 
Units
 
Weighted
Average
Fair Value
at Date of
Grant (a)
Outstanding at beginning of year
1,116,893

 
$
29.36

 
766,695

 
$
36.06

 
772,322

 
$
32.57

Units granted
292,776

 
22.53

 
666,172

 
27.22

 
190,846

 
49.82

Shares issued (b)
(112,757
)
 
37.08

 
(154,851
)
 
40.32

 
(127,087
)
 
34.48

Units forfeited
(109,128
)
 
32.35

 
(161,123
)
 
41.90

 
(69,386
)
 
37.91

Outstanding at end of year
1,187,784

 
$
26.67

 
1,116,893

 
$
29.36

 
766,695

 
$
36.06

Units vested at end of year
290,754

 
$
25.70

 
303,276

 
$
25.50

 
311,546

 
$
24.98