FAIR VALUE MEASUREMENTS: (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of financial assets and liabilities measured at fair value

	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, net	(112		)	(112		)	—		—
Trading securities	49,378			49,378			—		—
Total assets measured at fair value	$	207,181		$	113,128		$	84,568	$	9,485

	Estimated Fair Value December 31, 2011
	Total		Input Levels Used
	Fair Value		Level 1		Level 2		Level 3
Cash and equivalents	$	78,612	$	78,612	$	—	$	—
Auction rate security	7,453		—		—		7,453
Available for sale securities, excluding the auction rate security	57,835		—		57,835		—
Foreign currency forward contracts	205		—		205		—
Commodity futures contracts	203		203		—		—
Commodity options contracts	—		—		—		—
Trading securities	41,768		41,768		—		—
Total assets measured at fair value	$	186,076	$	120,583	$	58,040	$	7,453

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, 2012
	Amortized		Fair		Unrealized					Realized
Available for Sale:	Cost		Value		Gains		Losses			Losses
Auction rate security	$	8,410	$	9,485	$	1,075	$	—		$	—
Municipal bonds	84,199		84,551		352		—			—
Mutual funds	20		17		—		(3		)	—
	$	92,629	$	94,053	$	1,427	$	(3	)	$	—

	December 31, 2011
	Amortized		Fair		Unrealized					Realized
Available for Sale:	Cost		Value		Gains		Losses			Losses
Auction rate security	$	8,410	$	7,453	$	—	$	(957	)	$	—
Municipal bonds	57,389		57,791		402		—			—
Mutual funds	45		44		—		(1		)	—
	$	65,844	$	65,288	$	402	$	(958	)	$	—

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

	2012		2011
Balance at January 1	$	7,453	$	6,775
Unrealized gain recognized in accumulated other comprehensive loss	2,032		678
Balance at December 31	$	9,485	$	7,453

Schedule of assets measured at fair value on a nonrecurring basis

	December 31, 2012
	Fair Value		Level Used to Determine Fair Value
	Basis		Level 1		Level 2		Level 3
Equity method investment	$	2,127	$	—	$	—	$	2,127

	December 31, 2011
	Fair Value		Level Used to Determine Fair Value
	Basis		Level 1		Level 2		Level 3
Equity method investment	$	3,935	$	—	$	—	$	3,935

- Definition

Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).

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- 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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