Fair Value Disclosure of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2012

Notes To Financial Statements [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance At
							December 31, 2011
Assets
Derivative financial instruments	$	—	$	1,018	$	—	$	1,018
Liabilities
Derivative financial instruments	$	—	$	33,095	$	—	$	33,095

	Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance At
							March 31, 2012
Assets
Derivative financial instruments	$	—	$	1,367	$	—	$	1,367
Liabilities
Derivative financial instruments	$	—	$	29,360	$	—	$	29,360