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Employees, Retirement and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
A summary of performance unit activity and changes during the year ended December 31, 2011 is presented below:
 
Performance Units
Payable
In Units
 
 
Outstanding at January 1, 2011 (not vested)
59,415

Granted
8,969

Vesting and payment of units to recipients
(25,393
)
Forfeited
—

Outstanding at December 31, 2011 (not vested)
42,991
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
A summary of restricted unit activity and changes during the year ended December 31, 2011 is presented below:
 
Restricted Units
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
Weighted-
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
($000)
Outstanding at January 1, 2011 (not vested)
 
47,295

 
$
37.47

 
 
 
 
Granted
 
24,650

 
58.09

 
 
 
 
Vesting and transfer of full ownership to recipients
 
(34,607
)
 
39.67

 
 
 
 
Forfeited
 
(7,802
)
 
43.71

 
 
 
 
Outstanding at December 31, 2011 (not vested)
 
29,536

 
$
50.45

 
1 year
 
$
1,557