Fair Value (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value [Abstract]

Financial assets and liabilities recorded at fair value on a recurring basis

The following table sets forth, by level within the fair value hierarchy, the financial assets and liabilities recorded at fair value on a recurring basis as of December 31, 2011 and 2010 (in thousands):

	December 31, 2011		Level 1		Level 2		Level 3
Available-for-sale securities	$	31,582	$	31,582	$	—	$	—
Trading securities		30,486		30,486		—		—
Total assets	$	62,068	$	62,068	$	—	$	—
Fair value of interest rate swap agreements	$	254,228	$	—	$	254,228	$	—
Total liabilities	$	254,228	$	—	$	254,228	$	—
	December 31, 2010		Level 1		Level 2		Level 3
Available-for-sale securities	$	31,570	$	31,570	$	—	$	—
Trading securities		35,092		35,092		—		—
Total assets	$	66,662	$	66,662	$	—	$	—
Fair value of interest rate swap agreements	$	340,526	$	—	$	340,526	$	—
Total liabilities	$	340,526	$	—	$	340,526	$	—