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Investment Securities:
6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Investment [Text Block]
Investment Securities

Our investment securities consist of certificates of deposit, corporate bonds, commercial paper and federal tax-exempt state and municipal government debt. All investment securities are considered available-for-sale and are “investment grade”, carried at fair value, and there have been no gains or losses on their disposal. Unrealized gains and losses on available-for-sale securities, net of tax, are included in accumulated other comprehensive loss in the stockholders' equity section of our consolidated balance sheets. We had no gross unrealized gains or losses on available-for-sale securities at June 30, 2015 or December 31, 2014. The scheduled maturities of the debt securities are between 2015 and 2037 and are all callable within one year. The investment securities consist of the following at June 30, 2015 and December 31, 2014:
 
June 30, 2015
 
December 31, 2014
Federal tax-exempt debt securities
$
10,999

 
$
15,013

Corporate bonds
18,003

 
46,209

Commercial paper
3,986

 
3,846

Certificates of deposit
3,235

 
5,884

 
$
36,223

 
$
70,952