Fair Value (Fair Value by Balance Sheet Location) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net derivative asset (liability)	$ (81)	$ 25
Prepaid and Other Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	41	107
Derivative Asset
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	298	3,606
Derivative Liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	(420)	(3,390)
Other Long-Term Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	$ 0	$ (298)