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Short-term Investments | 12 Months Ended
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Dec. 31, 2016
Short Term Investments Abstract |
Short-term Investments | (5) Short-term Investments The Company periodically invests a portion of its excess cash in short-term investment instruments. Substantially all of the Company’s short-term investments are in U.S. Treasury securities and certificates of deposit, and the Company has the ability and intent to hold these investments to maturity. The stated maturity dates of these investments are between three months and one year from the purchase date. These held-to-maturity investments are recorded at amortized cost and included within “Short-term investments” on the accompanying Consolidated Balance Sheets. The fair value of held-to-maturity investments in U.S. Treasury securities and certificates of deposit is determined based on quoted market prices in active markets for identical securities (Level 1 inputs). The amortized cost, carrying value, and fair value of held-to-maturity investments at December 31, 2016 were $187.3 million, $187.3 million, and $187.3 million, respectively. The amortized cost, carrying value, and fair value of held-to-maturity investments at December 31, 2015 were $193.3 million, $193.3 million, and $193.2 million, respectively. The gross unrecognized holding gains and losses were not material for 2016, 2015, and 2014. No other-than-temporary impairments related to these investments have been recognized as of December 31, 2016 and 2015. As of December 31, 2016 and 2015, the Company’s available-for-sale investments were not material.

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