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Investment Securities: | 12 Months Ended
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Dec. 31, 2015
Investment Securities [Abstract] |
Investment Securities [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 income in the stockholders' equity section of our consolidated balance sheets. We have no gross unrealized gains or losses on available-for-sale securities at December 31, 2015 or 2014. The amortized cost of debt securities in this category is adjusted for amortization of premiums and accretion of discounts to maturity computed under the effective interest method. Such amortization is included in investment income in other income on our consolidated statements of income. Balances consist of the following at December 31:
|  | 2015 |  | 2014
Federal and municipal tax-exempt debt securities |  | $ | 4,951 |  |  | $ | 15,013 |
Corporate bonds |  | 25,400 |  |  | 46,209 |
U.S. Treasury securities |  | 7,537 |  |  | — |
Commercial paper |  | 2,097 |  |  | 3,846 |
Certificates of deposit |  | 1,248 |  |  | 5,884 |
|  | $ | 41,233 |  |  | $ | 70,952 |
The scheduled maturities of the debt securities are between 2016 and 2037 and are all callable within one year. Investment income, reflected in other income in our consolidated statements of income, was $0.5 million, $0.4 million and $0.4 million for the years ended December 31, 2015, 2014 and 2013, respectively.

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- Definition Investment Securities [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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