Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Hierarchy of Financial Assets Measured at Fair Value on Recurring Basis

The fair value hierarchy of ICG’s financial assets measured at fair value on a recurring basis was as follows (in thousands):

	Asset (liability) at December 31, 2013		Valuation Technique (Approach)		Level 1		Level 2		Level 3
Cash equivalents (money market accounts)	$	325,652		Market	$	325,652	$	—	$	—
	$	325,652			$	325,652	$	—	$	—

	Asset (liability) at December 31, 2012		Valuation Technique (Approach)		Level 1		Level 2		Level 3
Cash equivalents (money market accounts and commercial paper investments)	$	13,918		Market	$	13,918	$	—	$	—
	$	13,918			$	13,918	$	—	$	—

Goodwill and Intangibles, Net, Measured on Non-Recurring Basis Using Market Approach

The carrying value of certain of ICG’s other financial instruments, including accounts receivable and accounts payable approximates fair value due to the short-term nature of those instruments. The fair value of ICG’s long-term debt is based on assumptions concerning the amount and timing of estimated future cash flows and assumed risk-adjusted discount rates. See Note 9, “Debt” for further discussion. ICG’s non-financial assets measured on a non-recurring basis using the market approach were as follows (in thousands):

	As of December 31,
	2013		2012
Significant unobservable inputs (Level 3):
Goodwill (annual impairment assessment)	$	90,352	$	87,812
Acquired intangible assets (periodic assessment, as necessary)		58,755		61,687
	$	149,107	$	149,499