Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Assets and liabilities measured at fair value on a recurring basis

	March 31, 2012		Markets for Identical Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Deferred compensation plan investments	$	15,837	$	15,837	$	—	$	—
Total assets measured at fair value	$	15,837	$	15,837	$	—	$	—
	December 31, 2011		Markets for Identical Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
Deferred compensation plan investments	$	13,892	$	13,892	$	—	$	—
Total assets measured at fair value	$	13,892	$	13,892	$	—	$	—