Customer premise equipment includes costs incurred at the customer residence to secure new customers and revenue generating units. It also includes customer installation costs and customer premise equipment (e.g., set-top boxes and cable modems).
Scalable infrastructure includes costs not related to customer premise equipment, to secure growth of new customers and revenue generating units, or provide service enhancements (e.g., headend equipment).
Line extensions include network costs associated with entering new service areas (e.g., fiber/coaxial cable, amplifiers, electronic equipment, make-ready and design engineering).
Upgrade/rebuild includes costs to modify or replace existing fiber/coaxial cable networks, including betterments.
Support capital includes costs associated with the replacement or enhancement of non-network assets due to technological and physical obsolescence (e.g., non-network equipment, land, buildings and vehicles).
Transition represents incremental costs incurred to integrate the Legacy TWC and Legacy Bright House operations and to bring the three companies' systems and processes into a uniform operating structure.
Recently Issued Accounting Standards
See Note 19 to the accompanying consolidated financial statements contained in “Item 1. Financial Statements” for a discussion of recently issued accounting standards.
Item 3. Quantitative and Qualitative Disclosures About Market Risk.
We use derivative instruments to manage interest rate risk on variable debt and foreign exchange risk on the Sterling Notes, and do not hold or issue derivative instruments for speculative trading purposes.
Interest rate derivative instruments are used to manage interest costs and to reduce our exposure to increases in floating interest rates. We manage our exposure to fluctuations in interest rates by maintaining a mix of fixed and variable-rate debt. Using interest rate derivative instruments, we agree to exchange, at specified intervals through 2017, the difference between fixed and variable interest amounts calculated by reference to agreed-upon notional principal amounts.
Cross-currency derivative instruments are used to effectively convert £1.275 billion aggregate principal amount of fixed-rate British pound sterling denominated debt, including annual interest payments and the payment of principal at maturity, to fixed-rate U.S. dollar denominated debt. The cross-currency derivative instruments have maturities of June 2031 and July 2042. We are required to post collateral on the cross-currency derivative instruments when such instruments are in a liability position. In May 2016, we entered into a collateral holiday agreement for 80% of both the 2031 and 2042 cross-currency swaps, which eliminates the requirement to post collateral for three years. For more information, see Note 8 to the accompanying consolidated financial statements contained in “Item 1. Financial Statements.”
As of September 30, 2017 and December 31, 2016, the weighted average interest rate on the credit facility debt, including the effects of our interest rate swap agreements, was approximately 3.3% and 2.9%, respectively, and the weighted average interest rate on the senior notes was approximately 5.7% and 5.9%, respectively, resulting in a blended weighted average interest rate of 5.4% as of both time periods. The interest rate on approximately 88% and 87% of the total principal amount of our debt was effectively fixed, including the effects of our interest rate swap agreements as of September 30, 2017 and December 31, 2016, respectively.