Investment Securities:

9 Months Ended

Sep. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

Investment Securities

Our investment securities consist of certificates of deposit, corporate bonds, U.S. Treasury securities, 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 condensed consolidated balance sheets. We had no gross unrealized gains or losses on available-for-sale securities at September 30, 2016 or December 31, 2015. The scheduled maturities of the debt securities are between 2016 and 2042. All short-term investment securities are all callable within one year.

The investment securities consist of the following at September 30, 2016 and December 31, 2015 (in thousands):

	September 30, 2016		December 31, 2015
Federal and municipal tax-exempt debt securities	$	8,794	$	4,951
Corporate bonds	66,293		25,400
U.S. Treasury securities	30,052		7,537
Commercial paper	699		2,097
Certificates of deposit	799		1,248
Total investment securities	$	106,637	$	41,233

During the quarter ended September 30, 2016, we amended our investment policy to allow for the purchase of securities whose final maturities are in excess of one year. The amended policy continues to adhere to a low risk tolerance in regard to capital preservation while allowing for the achievement of higher available yields. The following table summarizes our investment securities by balance sheet classification at September 30, 2016 and December 31, 2015 (in thousands):

	September 30, 2016		December 31, 2015
Reported as:
Short-term investment securities	$	49,475	$	41,233
Long-term investment securities	57,162		—
Total	$	106,637	$	41,233