Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2013

Valuation and Qualifying Accounts

Summary of activity in valuation allowance and reserve accounts

Activity in the Partnership's allowance for doubtful accounts and deferred tax asset valuation allowance is as follows (in thousands):

	Year ended December 31,
	2013		2012			2011
Allowance for Doubtful Accounts
Balance at beginning of period	$	159	$	160		$	162
Other charges(1)		—		(1	)		(2	)
Balance at end of period	$	159	$	159		$	160
Deferred Tax Asset Valuation Allowance
Balance at beginning of period	$	904	$	977		$	1,036
Charged to costs and expenses		74		(73	)		(59	)
Balance at end of period	$	978	$	904		$	977

(1)

Bad debts written-off (net of recoveries).