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Marketable Securities | 6 Months Ended
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Jun. 30, 2018
Marketable Securities [Abstract] |
Marketable Securities | MARKETABLE SECURITIES As a result of the passage of the 2017 Tax Act during the fourth quarter of 2017, we liquidated our marketable securities held outside the U.S. during the first quarter of 2018 and recognized a loss of approximately $0.3 million. We repatriated these funds and reduced our revolving debt balance during the first quarter of 2018. The amortized cost and fair value of marketable securities as of December 31, 2017, were as follows (in thousands): ໿
As of December 31, 2017 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
﻿ |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 140,969 |  |  | $ | 96 |  |  | $ | (179 | ) |  | $ | 140,886 |
Certificates of deposit |  | 58,510 |  |  | — |  |  | — |  |  | 58,510 |
Commercial paper |  | 29,171 |  |  | — |  |  | — |  |  | 29,171 |
Asset backed securities |  | 22,206 |  |  | 4 |  |  | (43 | ) |  | 22,167 |
U.S. government bonds |  | 15,619 |  |  | 11 |  |  | (19 | ) |  | 15,611 |
Agency bonds |  | 10,990 |  |  | 9 |  |  | (52 | ) |  | 10,947 |
Treasury bills |  | 6,964 |  |  | — |  |  | (1 | ) |  | 6,963 |
Total marketable securities |  | $ | 284,429 |  |  | $ | 120 |  |  | $ | (294 | ) |  | $ | 284,255 |
We held marketable securities with effective maturities of two years or less that had an average AA- credit rating as of December 31, 2017.

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