Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Measurements

Assets measured at fair value on a recurring basis

	Balance Sheet Location	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		December 31, 2012 Total
Assets:
Investment in corporate debt securities	Other assets	$	—	$	6,790	$	—	$	6,790

	Balance Sheet Location	Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		December 31, 2011 Total
Assets:
Investment in corporate debt securities	Other assets	$	—	$	6,790	$	—	$	6,790