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Consolidated Statement Of Changes In Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2011
Distributions to Partners, per Common Unit	$ 0.51

X

- Definition

Aggregate distributions paid during the period for each common unit outstanding.

+ Details

Name:	drlp_CommonUnitDistributionsPerUnitCashPaid
Namespace Prefix:	drlp
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration