Fair Value Disclosures (Tables)

12 Months Ended

Dec. 31, 2012

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis, in thousands, are summarized below:

	Fair Value Measurement at December 31, 2012 Using:
Description	Carrying Amount		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Assets / Liabilities at Fair Value
Assets
Trading securities	$	46,144	$	46,144	$	—	$	—	$	46,144
Liabilities
Interest rate swaps	$	2,346	$	—	$	2,346	$	—	$	2,346
	Fair Value Measurement at December 31, 2011 Using:
Description	Carrying Amount		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Assets / Liabilities at Fair Value
Assets
Trading securities	$	29,535	$	29,535	$	—	$	—	$	29,535
Liabilities
Interest rate swaps	$	7,105	$	—	$	7,105	$	—	$	7,105