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Long-Term Debt | 12 Months Ended
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Dec. 31, 2014
Long Term Debt [Abstract] |
Long Term Debt | The following table summarizes the Company's debt facilities as of December 31, 2014. The Company's book value for both the individual and consolidated debt included in the table approximates fair value. The estimated fair value of its debt is based on interest rates available for debt with similar terms and remaining maturities. The Company has classified these instruments as Level 2 in the fair value hierarchy.
Facility or Arrangement |  | Original Principal Amount |  | Balance as of December 31, 2014(1)(2) |  | Interest Rate |  | Repayment terms
Credit Agreement term loan facility: |  |  |  |  |  |  |  |
U.S. dollar denominated: |  | $127.5 million |  | $125.9 million |  | Variable 30 day: 2.9117% |  | One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.
Japanese yen denominated: |  | 6.6 billion yen |  | 6.5 billion yen ($54.4 million as of December 31, 2014) |  | Variable 30 day: 2.8243% |  | One half of the principal amount payable in increasing quarterly installments over a five-year period beginning on December 31, 2014, with the remainder payable at the end of the five-year term.
Credit Agreement revolving credit facility: |  |  |  |  |  |  |  |
|  |  |  | $72.5 million |  | Variable 30 day: 2.9117% |  | Revolving line of credit expires October 2019.
Korean subsidiary loan: |  | $20.0 million |  | ─ |  | 2.5% |  | Paid in full.
(1) | As of December 31, 2014, the current portion of the Company's debt (i.e. becoming due in the next 12 months) included $79.7 million of the balance of its U.S. dollar denominated debt under the Credit Agreement facility and $3.1 million of the balance of its Japanese yen-denominated debt under the Credit Agreement facility. The Company has classified the amounts 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.
(2) | The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $5.5 million, which is not reflected in this table.
As of December 31, 2013, the Company had debt pursuant to various credit facilities and other borrowings. The following table summarizes the Company's debt facilities as of December 31, 2013. The Company's book value for both the individual and consolidated debt included in the table approximates fair value. The estimated fair value of its debt is based on interest rates available for debt with similar terms and remaining maturities. The Company has classified these instruments as Level 2 in the fair value hierarchy.
Facility or Arrangement |  | Original Principal Amount |  | Balance as of December 31, 2013 |  | Interest Rate |  | Repayment terms
Multi-currency uncommitted shelf facility: |  |  |  |  |  |  |  |
U.S. dollar denominated: |  | $40.0 million |  | $17.1 million |  | 6.2% |  | Paid in full on October 10, 2014.
|  | $20.0 million |  | $11.4 million |  | 6.2% |  | Paid in full on October 10, 2014.
Japanese yen denominated: |  | 3.1 billion yen |  | 0.4 billion yen ($4.1 million as of December 31, 2013) |  | 1.7% |  | Paid in full on October 10, 2014.
|  | 2.3 billion yen |  | 1.3 billion yen ($12.3 million as of December 31, 2013) |  | 2.6% |  | Paid in full on October 10, 2014.
|  | 2.2 billion yen |  | 1.2 billion yen ($11.8 million as of December 31, 2013) |  | 3.3% |  | Paid in full on October 10, 2014.
|  | 8.0 billion yen |  | 8.0 billion yen ($75.8 million as of December 31, 2013) |  | 1.7% |  | Paid in full on October 10, 2014.
Revolving credit facilities |  |  |  |  |  |  |  |
2010 |  |  |  | $35.0 million |  | Variable 30 day: 0.670% |  | Revolving line of credit paid in full prior to August 8, 2014.
2013 |  |  |  | $14.0 million |  | Variable 30 day: 0.5933% |  | Revolving line of credit paid in full on October 10, 2014.
Interest expense relating to debt totaled $5.2 million, $3.0 million and $5.7 million for the years ended December 31, 2012, 2013 and 2014, respectively. Maturities of all long-term debt at December 31, 2014, based on the year-end exchange rate, are as follows (U.S. dollars in thousands):
Year Ending December 31, |  |  |
2015 |  | $ | 82,770 |
2016 |  |  | 14,834 |
2017 |  |  | 19,398 |
2018 |  |  | 23,963 |
2019 |  |  | 111,826 |
Thereafter |  |  | - |
Total (1) |  | $ | 252,791 |
(1) | The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $5.5 million, which is not reflected in this table.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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