Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Investments in available-for-sale securities were classified as follows:



	June 30, 2016		December 31, 2015
Current	$	352,021	$	520,144
Non-current	109,337		48,081
Total available-for-sale securities	$	461,358	$	568,225

Available-for-sale Securities

The cost, gross unrealized gains, gross unrealized losses and fair value of the Company's available-for-sale securities were as follows:



	June 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses ⁽¹⁾			Fair Value
Debt securities
Corporate bonds	$	219,971	$	1,162	$	(16	)	$	221,117
U.S. government debt ⁽²⁾	72,702		462		—			73,164
Asset-backed securities	57,546		197		(3		)	57,740
Equity securities	60,281		49,194		(138		)	109,337
Total available-for-sale securities	$	410,500	$	51,015	$	(157	)	$	461,358



	December 31, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses ⁽¹⁾			Fair Value
Debt securities
Corporate bonds	$	336,665	$	55	$	(1,076	)	$	335,644
U.S. government debt ⁽²⁾	135,226		2		(374		)	134,854
Asset-backed securities	49,759		2		(115		)	49,646
Equity securities	54,371		466		(6,756		)	48,081
Total available-for-sale securities	$	576,021	$	525	$	(8,321	)	$	568,225

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(1)	All unrealized loss positions were held at a loss for less than 12 months.


(2)	U.S. Treasury obligations, U.S. government agency obligations and U.S government agency mortgage-backed securities.

Schedule of Realized Gain (Loss)

The proceeds from sales and maturities of available-for-sale securities included in the consolidated statements of cash flows and the gross realized gains and losses included in the consolidated statements of operations are reflected in the table below. The cost of securities sold was determined using the specific identification method.



	Three Months Ended June 30,					Six Months Ended June 30,
	2016			2015		2016			2015
Proceeds from sales and maturities of securities	$	275,573		$	15,037	$	302,432		$	15,037
Gross realized gains	1,280			3,795		1,341			3,795
Gross realized losses	(13		)	—		(22		)	—

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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