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Fair Value Measurement: (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Fair Value, Measurement Inputs, Disclosure [Text Block]
 
Fair value measurements at June 30, 2013 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
$
73,395

 
$
5,060

 
$
68,335

 
$

 
$
73,395

 
$
5,060

 
$
68,335

 
$

 
 
 
Fair value measurements at December 31, 2012 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
$
79,259

 
$
8,490

 
$
70,769

 
$

 
$
79,259

 
$
8,490

 
$
70,769

 
$