Fair Value (Fair Value by Balance Sheet Location) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net derivative asset (liability)	$ (4,335)	$ (2,465)
Prepaid and other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	245	403
Derivative Liability - Current
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	(4,265)	(2,653)
Other Long-Term Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	$ (315)	$ (215)