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Incentive, Retirement and Deferred Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2014
Compensation Related Costs [Abstract]  
Performance Unit Fair Value Assumptions
The following table presents a summary of the fair value of the performance units and the related assumptions for all outstanding units as of December 31, 2014 and 2013.
 
December 31,
 
2014
 
2013
Expected price volatility range
26.6
%
-
86.6
%
 
27.0
%
-
44.8
%
Weighted-average risk-free interest rate
 
 
0.5
%
 
 
 
0.4
%
Weighted-average fair value per unit
 
 
$
13.85

 
 
 
$
97.06


Performance unit activity for the years ended December 31, 2014 and 2013 was as follows:
 
December 31,
 
2014
 
2013
Outstanding at January 1
31,142

 

Granted
47,015

 
31,142

Forfeited /canceled
(12,060
)
 

Outstanding at December 31
66,097

 
31,142

 
 
 
 
Performance period ending December 31, 2015
 
 
 
Vested
9,208

 
12,178

Unvested
18,874

 
18,964

Performance period ending December 31, 2016
 
 
 
Vested
12,671

 

Unvested
25,344