Valuation Accounts

12 Months Ended

Dec. 31, 2011

Valuation Accounts [Abstract]

Valuation Accounts

Schedule II - Valuation Accounts

			Additions
	Balance at										Balance at
	Beginning		Charges to								End of
(in thousands)	of Period		Operations			Other			Deductions		Period
Year ended December 31, 2011:
Allowance for doubtful accounts (1)	$	586		546			(23	)		15		1,094
Year ended December 31, 2010:
Allowance for doubtful accounts (1)	$	417		385			(29	)		187		586
Year ended December 31, 2009:
Allowance for doubtful accounts (1)	$	1,072		(51	)		(6	)		598		417

(1) Deductions in the allowance for doubtful accounts represent write-offs, net of recoveries, of amounts determined to be uncollectible.