Other Expense (Schedule Of Components Of Other Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Other Expense [Abstract]
Transportation commitment charges	$ 9,377	[1]	$ 8,453	[1]
Other	4,565		2,911
Above market drilling rig rates	3,507	[2]	4,986	[2]
Inventory valuation charges	1,587	[3]	6,041	[3]
Contingency and environmental accrual adjustments	1,294		1,216
Terminated drilling rig contract charges	1,019		0
Total other expense	$ 21,349		$ 23,607

[1] Primarily represents firm transportation payments on excess pipeline capacity commitments.

[2] Primarily represents expenses attributable to the portion of Pioneer's contracted drilling rig rates that are above current market rates and idle drilling rig fees, neither of which are charged to joint operations.

[3] Represents valuation charges on excess materials and supplies inventories.