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Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Liabilities [Abstract]
Debt	$ 843,793	$ 455,028
[FairValueMember]
Assets [Abstract]
Derivative Instruments	0	1,247
Liabilities [Abstract]
Debt	869,488	419,847
Derivative Instruments	7,402	16,067
[CarryingReportedAmountMember]
Assets [Abstract]
Derivative Instruments	0	1,247
Liabilities [Abstract]
Debt	859,506	467,378
Derivative Instruments	$ 7,402	$ 16,067

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details