FAIR VALUE MEASUREMENTS: (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of financial assets and liabilities measured at fair value

	Estimated Fair Value December 31, 2013
	Total			Input Levels Used
	Fair Value			Level 1			Level 2			Level 3
Cash and equivalents	$	88,283		$	88,283		$	—		$	—
Available for sale securities	118,647			—			118,647			—
Foreign currency forward contracts	(684		)	—			(684		)	—
Commodity futures contracts, net	(130		)	(130		)	—			—
Trading securities	63,215			63,215			—			—
Total assets measured at fair value	$	269,331		$	151,368		$	117,963		$	—

	Estimated Fair Value December 31, 2012
	Total			Input Levels Used
	Fair Value			Level 1			Level 2		Level 3
Cash and equivalents	$	63,862		$	63,862		$	—	$	—
Auction rate security	9,485			—			—		9,485
Available for sale securities, excluding the auction rate security	84,568			—			84,568		—
Commodity futures contracts	(112		)	(112		)	—		—
Trading securities	49,378			49,378			—		—
Total assets measured at fair value	$	207,181		$	113,128		$	84,568	$	9,485

Summary of the aggregate fair value, gross unrealized gains, gross unrealized losses, realized losses and amortized cost basis of investment portfolio by major security type

	December 31, 2013
	Amortized		Fair		Unrealized					Realized
Available for Sale:	Cost		Value		Gains		Losses			Losses
Municipal bonds	$	75,488	$	75,622	$	134	$	—		$	—
Corporate bonds	37,258		37,214		—		(44		)	—
Certificates of deposit	5,796		5,794				(2		)
Mutual funds	20		17		—		(3		)	—
	$	118,562	$	118,647	$	134	$	(49	)	$	—

	December 31, 2012
	Amortized		Fair		Unrealized					Realized
Available for Sale:	Cost		Value		Gains		Losses			Losses
Auction rate security	$	8,410	$	9,485	$	1,075	$	—		$	—
Municipal bonds	65,745		66,002		257		—			—
Corporate bonds	14,614		14,744		130
Certificates of deposit	3,840		3,805				(35		)
Mutual funds	20		17		—		(3		)	—
	$	92,629	$	94,053	$	1,462	$	(38	)	$	—

Schedule of financial instruments measured at fair value on a recurring basis using significant unobservable inputs (Level 3)

	2013			2012
Balance at January 1	$	9,485		$	7,453
Unrealized gain recognized in accumulated other comprehensive loss	1,355			2,032
Settlement of security	(10,840		)	—
Balance at December 31	$	—		$	9,485

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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