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Debt, Debt Facilities (Details) $ in Thousands, ¥ in Billions | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 JPY (¥) | Apr. 18, 2018 USD ($) | 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 | $ 97,481 |  |  |  | $ 77,840 |  |  |  |  |  |
Unamortized debt issuance costs | 4,500 |  |  |  | 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 | $ 395,000 | [1],[2] |  |  | 0 |  |  |  |  |  |
Interest rate | Variable 30 day: 4.344% |  |  |  |  |  |  |  |  |  |
Interest rate | 4.344% |  | 4.344% |  |  |  |  |  |  |  |
Term of variable rate | 30 days |  |  |  |  |  |  |  |  |  |
Repayment terms | 35% of the principal amount is payable in increasing quarterly installments over a five-year period beginning 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 | $ 74,500 | [1],[2] |  |  | 0 |  |  |  |  |  |
Interest rate | Variable 30 day: 4.344% |  |  |  |  |  |  |  |  |  |
Interest rate | 4.344% |  | 4.344% |  |  |  |  |  |  |  |
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 | $ 3,000 |  | ¥ 0.3 |  | 5,900 |  | ¥ 0.7 |  |  |  |
Interest rate | 0.66% |  | 0.66% |  |  |  |  |  |  |  |
Repayment terms | Payable in semi-annual installments over three years that began on January 31, 2016. |  |  |  |  |  |  |  |  |  |
Frequency of payment | Semi-annual |  |  |  |  |  |  |  |  |  |
Term of loan | 3 years |  |  |  |  |  |  |  |  |  |
Current portion of debt | $ 3,000 |  |  |  |  |  |  |  |  |  |
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 $4.5 million as of June 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 June 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 and $3.0 million of the Japan subsidiary loan. The Company has classified the $78.5 million borrowed under the revolving line of credit as short term 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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