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Debt, Debt Facilities (Details) $ in Thousands, ¥ in Billions | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 JPY (¥) | Apr. 18, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 JPY (¥) | Jun. 16, 2016 USD ($) | Oct. 09, 2014 USD ($) | Oct. 09, 2014 JPY (¥)
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current portion of debt | $ 82,455 |  |  |  | $ 77,840 |  |  |  |  |  |
Unamortized debt issuance costs | 4,200 |  |  |  | 4,000 |  |  |  |  |  |
Unamortized debt discount |  |  |  |  | 9,100 |  |  |  |  |  |
October 2014 Credit Agreement Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount | 127,500 |  |  |  |  |  |  |  |  | $ 127,500 |
Balance | $ 0 |  |  |  | 94,800 | [1] |  |  |  |  |
Interest rate | Variable 30 day: 4.627% |  |  |  |  |  |  |  |  |  |
Interest rate | 4.627% |  | 4.627% |  |  |  |  |  |  |  |
Term of variable rate | 30 days |  |  |  |  |  |  |  |  |  |
Repayment terms | Principal amount was paid in full during April 2018. |  |  |  |  |  |  |  |  |  |
Term of loan | 5 years |  |  |  |  |  |  |  |  |  |
Current portion of debt | $ 20,000 |  |  |  |  |  |  |  |  |  |
October 2014 Credit Agreement Japanese Yen Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount | ¥ |  |  | ¥ 6.6 |  |  |  |  |  |  |  | ¥ 6.6
Balance | $ 0 |  | ¥ 0.0 |  | 43,500 | [1] | ¥ 4.9 | [1] |  |  |
Interest rate | Variable 30 day: 2.7595% |  |  |  |  |  |  |  |  |  |
Interest rate | 2.7595% |  | 2.7595% |  |  |  |  |  |  |  |
Term of variable rate | 30 days |  |  |  |  |  |  |  |  |  |
Repayment terms | Principal amount was paid in full during April 2018. |  |  |  |  |  |  |  |  |  |
Term of loan | 5 years |  |  |  |  |  |  |  |  |  |
October 2014 Credit Agreement Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Balance | $ 0 |  |  |  | 47,500 | [1] |  |  |  |  |
Interest rate | Variable 30 day: 4.594% |  |  |  |  |  |  |  |  |  |
Interest rate | 4.594% |  | 4.594% |  |  |  |  |  |  |  |
Term of variable rate | 30 days |  |  |  |  |  |  |  |  |  |
Repayment terms | Principal amount was paid in full during April 2018 and credit line was closed. |  |  |  |  |  |  |  |  |  |
Term of loan | 5 years |  |  |  |  |  |  |  |  |  |
April 2018 Credit Agreement Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount | $ 400,000 |  |  | $ 400,000 |  |  |  |  |  |  |
Balance | $ 390,000 | [1],[2] |  |  | 0 |  |  |  |  |  |
Interest rate | Variable 30 day: 4.49% |  |  |  |  |  |  |  |  |  |
Interest rate | 4.49% |  | 4.49% |  |  |  |  |  |  |  |
Term of variable rate | 30 days |  |  |  |  |  |  |  |  |  |
Repayment terms | 35% of the principal amount is payable in increasing quarterly installments over a five-year period that began on June 30, 2018, with the remainder payable at the end of the five-year term. |  |  |  |  |  |  |  |  |  |
Percentage of principal payable in installments | 35.00% |  |  |  |  |  |  |  |  |  |
Frequency of payment | Quarterly |  |  |  |  |  |  |  |  |  |
Term of loan | 5 years |  |  |  |  |  |  |  |  |  |
April 2018 Credit Agreement Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Balance | $ 62,500 | [1],[2] |  |  | 0 |  |  |  |  |  |
Interest rate | Variable 30 day: 4.49% |  |  |  |  |  |  |  |  |  |
Interest rate | 4.49% |  | 4.49% |  |  |  |  |  |  |  |
Term of variable rate | 30 days |  |  |  |  |  |  |  |  |  |
Repayment terms | Revolving line of credit expires April 18, 2023. |  |  |  |  |  |  |  |  |  |
Term of loan | 5 years |  |  |  |  |  |  |  |  |  |
Japan Subsidiary Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount | ¥ |  |  | ¥ 2.1 |  |  |  |  |  |  |  |
Balance | $ 0 |  | ¥ 0.0 |  | 5,900 |  | ¥ 0.7 |  |  |  |
Interest rate | 0.66% |  | 0.66% |  |  |  |  |  |  |  |
Repayment terms | Principal amount was paid in full during July 2018. |  |  |  |  |  |  |  |  |  |
Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original principal amount | $ 210,000 |  |  |  |  |  |  |  | $ 210,000 |  |
Balance | $ 0 |  |  |  | 210,000 | [1] |  |  |  |  |
Interest rate | 7.10% |  | 7.10% |  |  |  |  |  |  |  |
Interest rate | 4.75% |  | 4.75% |  |  |  |  |  |  |  |
Repayment terms | Principal amount was paid in full during April 2018. |  |  |  |  |  |  |  |  |  |
Unamortized debt discount and debt issuance costs |  |  |  |  | 11,100 |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unamortized debt discount and debt issuance costs |  |  |  |  | $ 2,000 |  |  |  |  |  |
[1] | The carrying value of the debt reflects the amounts stated in the above table less debt issuance costs of $4.2 million as of September 30, 2018 related to the credit agreement; and a debt discount of $9.1 million and debt issuance costs of $4.0 million (consisting of $11.1 million related to the Convertible Note and $2.0 million related to the credit agreement) as of December 31, 2017, which is not reflected in this table.
[2] | As of September 30, 2018, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $20.0 million of the balance of its U.S. dollar denominated debt under the New Credit Agreement facility. The Company has classified the $62.5 million borrowed under the revolving line of credit as short-term debt because it is the Company's intention to use the line of credit to borrow and pay back funds over short periods of time.

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