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Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Assets and (Liabilities) at Fair Value
Liabilities under derivative instruments	$ (781)	$ (1,690)
Ineffectiveness on hedges recorded in earnings	0	0
Recurring \| Total
Assets and (Liabilities) at Fair Value
Liabilities under derivative instruments	(781)	(1,690)
Total	(781)	(1,690)
Recurring \| Level 2
Assets and (Liabilities) at Fair Value
Liabilities under derivative instruments	(781)	(1,690)
Total	$ (781)	$ (1,690)

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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- 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.

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