Accounting Policy (Accumulated OCI) (Textuals) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Reclassification Out Of Accumulated Other Comprehensive Income1 [Line Items]
Reclassified cash flow hedge (gains) losses	$ 280	$ (12)
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Out Of Accumulated Other Comprehensive Income1 [Line Items]
Reclassified cash flow hedge (gains) losses	$ (300)	$ 100

The amount of net gains or losses on price risk cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income.

No definition available.

Name:	us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration