Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2011

Long-Term Debt [Abstract]

Components Of Long-Term Debt

	December 31,
	2011			2010
	(in thousands)
Outstanding debt principal balances:
Pioneer credit facility	$	—		$	49,000
Pioneer Southwest credit facility		32,000			81,200
5.875% senior notes due 2016		455,385			455,385
6.65% senior notes due 2017		485,100			485,100
6.875 % senior notes due 2018		449,500			449,500
7.500 % senior notes due 2020		450,000			450,000
7.20% senior notes due 2028		250,000			250,000
2.875% convertible senior notes due 2038		479,930			480,000
		2,601,915			2,700,185
Issuance discounts and premiums, net		(71,301	)		(96,515	)
Net deferred fair value hedge losses		(1,709	)		(2,000	)
Total long-term debt	$	2,528,905		$	2,601,670

Principal Maturities Of Long-Term Debt

2012	$	—
2013	$	511,930
2014	$	—
2015	$	—
2016	$	455,385
Thereafter	$	1,634,600

Interest Expense

	Year Ended December 31,
	2011			2010			2009
	(in thousands)
Cash payments for interest	$	165,307		$	155,854		$	151,246
Accretion/amortization of discounts or premiums on loans		25,210			23,304			21,388
Accretion of discount on derivative obligations		—			521			874
Accretion of discount on postretirement benefit obligations		315			433			657
Amortization of net deferred hedge losses (see Note I)		573			517			465
Amortization of capitalized loan fees		5,385			5,698			4,612
Net changes in accruals		(1,768	)		11,999			3,762
Interest incurred		195,022			198,326			183,004
Less capitalized interest		(13,362	)		(15,242	)		(9,651	)
Total interest expense	$	181,660		$	183,084		$	173,353