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External Debt and Financing Arrangements
9 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]  
External Debt and Financing Arrangements
7. External Debt and Financing Arrangements

In June 2015, we issued $900 million of unsecured senior notes (“Senior Notes”) in a registered public offering. The Senior Notes consist of two tranches: $400 million of five-year notes due 2020 with a coupon of 3% and $500 million of ten-year notes due 2025 with a coupon of 4%. We used the proceeds from the Senior Notes offering to pay down our revolving credit facility and for general purposes. On September 30, 2015, the outstanding amount of the Senior Notes, net of underwriting commissions and price discounts, was $891.4 million.

We have a $975 million committed revolving credit facility, as well as a term loan in the initial amount of $525 million, both of which expire in July 2018. Both facilities can be used for general corporate purposes. On September 30, 2015 and December 31, 2014, our outstanding borrowings under the revolving credit facility were zero and $145.0 million, respectively; the amounts outstanding under the term loan were $450.0 million and $525.0 million, respectively. At September 30, 2015 and December 31, 2014, the current portion of long-term debt was $3.8 million and $26.3 million, respectively. The interest rates under all of these facilities are variable based on LIBOR at the time of the borrowing and the Company’s leverage as measured by a debt to Adjusted EBITDA ratio. Based upon the Company’s debt to Adjusted EBITDA ratio at September 30, 2015, the Company’s borrowing rate could range from LIBOR + 1.0% to LIBOR + 2.0%. At September 30, 2015, we were in compliance with all covenants under these facilities.

We currently have uncommitted bank lines of credit in China, which provide for unsecured borrowings for working capital of up to $25.7 million in aggregate, of which zero was outstanding, as of September 30, 2015 and December 31, 2014. The weighted-average interest rates on these borrowings were zero and 8.2% in the nine-month periods ended September 30, 2015 and 2014, respectively. The weighted-average interest rates on these borrowings were zero and 12.2% in the three-month periods ended September 30, 2015 and 2014, respectively.