Note 6. Investments

ARRIS’s investments consisted of the following (in thousands):


	As of June 30, 2018		As of December 31, 2017
Current Assets:
Available-for-sale securities	$	46,698	$	23,874
Noncurrent Assets:
Available-for-sale securities		5,662		5,718
Equity method investments		21,402		22,021
Cost method investments		10,092		10,092
Other investments		32,746		33,251

Total classified as non-current assets		69,902		71,082

Total	$	116,600	$	94,956

Available-for-sale securities - ARRIS’s investments in debt and marketable equity securities are categorized as available-for-sale and are carried at fair value. Realized gains and losses on available-for-sale securities are included in net income. Unrealized gains and losses on available-for-sale debt securities are included in the Consolidated Balance Sheets as a component of accumulated other comprehensive income (loss).

The amortized costs and fair value of available-for-sale securities were as follows (in thousands):


	June 30, 2018									December 31, 2017
	Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Costs		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit (non-U.S.)	$	46,698	$	—	$	—		$	46,698	$	12,809	$	—	$	—		$	12,809
Corporate bonds		—		—		—			—		11,003		86		(24	)		11,065
Corporate obligations		14		—		—			14		13		—		—			13
Money markets		37		—		—			37		38		—		—			38
Mutual funds		86		—		(4	)		82		65		14		—			79
Other investments		5,805		285		(561	)		5,529		4,941		744		(97	)		5,588

Total	$	52,640	$	285	$	(565	)	$	52,360	$	28,869	$	844	$	(121	)	$	29,592

The following table represents the breakdown of the available-for-sale investments with gross unrealized losses and the duration that those losses had been unrealized (in thousands):


	June 30, 2018
	Less than 12 months					12 months or more				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Certificates of deposit (non-U.S.)	$	46,698	$	—		$	—	$	—	$	46,698	$	—
Corporate obligations		14		—			—		—		14		—
Money markets		37		—			—		—		37		—
Mutual funds		82		(4	)		—		—		82		(4	)
Other investments		5,529		(561	)		—		—		5,529		(561	)

Total	$	52,360	$	(565	)	$	—	$	—	$	52,360	$	(565	)


	December 31, 2017
	Less than 12 months					12 months or more				Total
	Fair value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Certificates of deposit (non-U.S.)	$	12,809	$	—		$	—	$	—	$	12,809	$	—
Corporate bonds		11,065		(24	)		—		—		11,065		(24	)
Corporate obligations		13		—			—		—		13		—
Money markets		38		—			—		—		38		—
Mutual funds		79		—			—		—		79		—
Other investments		5,588		(97	)		—		—		5,588		(97	)

Total	$	29,592	$	(121	)	$	—	$	—	$	29,592	$	(121	)

As of June 30, 2018, for fixed income securities that were in unrealized loss positions, the Company has determined that (i) it does not have the intent to sell any of these investments, and (ii) it is more likely than not that it will not be required to sell any of these investments before recovery of the entire amortized cost basis.

The sale and/or maturity of available-for-sale securities resulted in the following activity (in thousands):


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Proceeds from sales	$	549	$	58,416	$	11,549	$	150,301
Gross gains		—		2		5		12
Gross losses		—		—		—		—

The contractual maturities of the Company’s available-for-sale securities as of June 30, 2018 are shown below. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties (in thousands):


	June 30, 2018
	Amortized Cost		Fair Value
Within 1 year	$	46,698	$	46,698
After 1 year through 5 years		—		—
After 5 years through 10 years		—		—
After 10 years		5,942		5,662

Total	$	52,640	$	52,360

Other-than-temporary investment impairments - ARRIS evaluates its investments for any other-than-temporary impairment on a quarterly basis considering all available evidence, including changes in general market conditions, specific industry and individual entity data, the financial condition and the near-term prospects of the entity issuing the security, and the Company’s ability and intent to hold the investment until recovery. For the three and six months ended June 30, 2018, ARRIS concluded that no other-than-temporary impairment losses existed.

For the three and six months ended June 30, 2017, the Company concluded that one private company had indicators of impairment, as the cost basis exceeded the fair value of the investments resulting in other-than-temporary impairment charges of $2.8 million. These charges are reflected in the Consolidated Statements of Operations.

Classification of securities as current or non-current is dependent upon management’s intended holding period, the security’s maturity date and liquidity consideration based on market conditions. If management intends to hold the securities for longer than one year as of the balance sheet date, they are classified as non-current.