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Fair Value Measurement: (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Disclosures [Abstract]  
Fair Value, Measurement Inputs, Disclosure [Table Text Block]
The following table provides the assets and liabilities carried at fair value measured on a recurring basis. 
 
Fair value measurements at December 31, 2011 using
 
Total carrying
value
 
Quoted prices
in active
markets for
identical
assets (level 1)
 
Significant
other
observable
inputs (level 2)
 
Significant
unobservable
inputs (level 3)
Available for sale securities
$
60,395

 
$
5,459

 
$
54,936

 
$

 
$
60,395

 
$
5,459

 
$
54,936

 
$

 
 
 
Fair value measurements at December 31, 2010 using
 
Total carrying
value
 
Quoted prices
in active
markets for
identical
assets (level 1)
 
Significant
other
observable
inputs (level 2)
 
Significant
unobservable
inputs (level 3)
Available for sale securities
$
14,507

 
$
2,820

 
$
11,687

 
$

 
$
14,507

 
$
2,820

 
$
11,687

 
$

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
:
 
Level 3 changes in fair value (pre-tax): 
 
2011
 
2010
Beginning balance
$

 
$
900

Transfer into Level 3

 

Sales

 
(900
)
Unrealized holding loss, included in other comprehensive income

 

Ending balance
$

 
$