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Fair Value of Financial Instruments | 12 Months Ended
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Dec. 31, 2016
Fair Value of Financial Instruments [Abstract] |
Fair Value of Financial Instruments | 3. Investments As of December 31, 201 6 and 2015, the Company’s investments consist ed of U.S. treasury notes with maturities up to approximately two years and were classified as available-for-sale. Fair market value of U.S. treasury notes is measured on a recurring basis based on Level 1 inputs (level inputs are described in Note 1 under “Fair Value Measurements”). The Company designates the appropriate classification of its investments at the time of purchase based upon the intended holding period. During the year ended December 31, 2015, the Company transferred the classification of its investments from held-to-maturity to available-for-sale due to anticipated liquidity needs related to increased repurchases of shares of the Company’s common stock. The carrying value of held-to-maturity securities transferred to available-for-sale during the year ended December 31, 2015 was $1,040,850 and the fair market value of those securities was determined to be $1,038,138, resulting in an unrealized holding loss of $2,712. As a result, the Company recorded $2,468 ($1,522, net of tax) of unrealized holding losses in other comprehensive income (loss), and an other-than-temporary impairment charge of $244 in interest and other income (expense), in the consolidated statement of income and comprehensive income. The following is a summary of available-for-sale securities:
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﻿ | December 31,
﻿ | 2016 |  | 2015
﻿Amortized cost | $ | 455,109 |  | $ | 1,040,850
﻿Unrealized gains (losses) |  | (218) |  |  | (2,712)
﻿Fair market value | $ | 454,891 |  | $ | 1,038,138
﻿ The following is a summary of unrealized gains (losses) of available-for-sale securities recorded in other comprehensive income (loss): ﻿
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﻿ |  |  |  | Year ended December 31,
﻿ |  |  |  | 2016 |  | 2015 |  | 2014
﻿Unrealized gains (losses) on available-for-sale securities |  |  |  | $ | 2,251 |  | $ | (2,468) |  | $ | -
﻿Unrealized gains (losses) on available-for-sale securities, net of tax |  |  |  | $ | 1,402 |  | $ | (1,522) |  | $ | -
﻿ The following is a summary of available-for-sale securities activity recorded in interest and other income (expense) in the consolidated statement of income and comprehensive income: ﻿
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﻿ |  |  |  | Year ended December 31,
﻿ |  |  |  | 2016 |  | 2015 |  | 2014
﻿Realized gains (losses) from sale of available-for-sale securities |  |  |  | $ | 547 |  | $ | - |  | $ | -
﻿Other-than-temporary impairment |  |  |  | $ | - |  | $ | 244 |  | $ | -
The Company has elected to fund certain deferred compensation obligations through a rabbi trust, the assets of which are designated as trading securities, as described further in Note 7. “Employee Benefit Plans.”

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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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