7. FAIR VALUE MEASUREMENTS

The Company’s financial instruments consist primarily of cash and cash equivalents, trade receivables, trade payables, available-for-sale securities, debt instruments and foreign currency contracts. For cash and cash equivalents, trade receivables and trade payables, the carrying amounts of these financial instruments as of September 30, 2015 and December 31, 2014 were considered representative of their fair values due to their short terms to maturity. The fair value of the Company’s available-for-sale securities was based on quoted market prices. The fair values of the Company’s debt instruments and foreign currency contracts were based on indicative quotes.

Fair value measurements using quoted prices in active markets for identical assets and liabilities fall within Level 1 of the fair value hierarchy, measurements using significant other observable inputs fall within Level 2, and measurements using significant unobservable inputs fall within Level 3.

The carrying amounts, estimated fair values and valuation input levels of the Company’s available-for-sale securities, foreign currency contracts, and debt instruments as of September 30, 2015 and December 31, 2014, are as follows:


	September 30, 2015				December 31, 2014
	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Valuation Inputs
Assets:
Available-for-sale securities	$	10,737	$	10,737	$	20,392	$	20,392		Level 1
Foreign currency contracts		1,027		1,027		1,165		1,165		Level 2
Liabilities:
6.00% senior notes due 2025		1,500,000		1,436,250		—		—		Level 2
5.50% senior notes due 2024		650,000		614,250		650,000		640,250		Level 2
5.00% senior notes due 2021		650,000		632,125		650,000		643,500		Level 2
Senior PIK toggle notes due 2020		550,000		561,000		550,000		566,500		Level 2
4.375% senior secured notes due 2020		500,000		495,000		—		—		Level 2
Senior secured term loan due 2022, at par		1,250,000		1,249,969		—		—		Level 2
Senior secured term loan due 2018, at par		361,875		361,187		518,438		513,254		Level 2
Senior secured term loan due 2017, at par		—		—		345,625		342,169		Level 2
Foreign currency contracts		3,141		3,141		3,584		3,584		Level 2

During the three and nine months ended September 30, 2015, the Company recorded a pretax goodwill impairment charge of $74.4 million related to the Wireless segment as a result of reduced expectations of future cash flows from one of its reporting units. The valuation supporting the goodwill impairment charge is based on Level 3 valuation inputs. Also, during the three and nine months ended September 30, 2015, the Company recorded an impairment charge of $10.9 million to reduce a note receivable in the Broadband segment to its estimated fair value. The valuations supporting the impairment charges were based on Level 3 valuation inputs.