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Fair Value Measurements (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets/(Liabilities) at Fair Value
Fair Value Measurements at Reporting Date
Derivative assets	$ 1,156	$ 287
Derivative liabilities	(5,212)	(7,222)
Quoted Prices in Active Markets for Identical Liabilities (Level 1)
Fair Value Measurements at Reporting Date
Derivative assets	1,156	287
Derivative liabilities	$ (5,212)	$ (7,222)

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