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Fair Value Measurements (Fair Value of Liabilities Measured on Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Fair Value on a recurring basis [Member]
Level 1 [Member]
Dec. 31, 2012
Fair Value on a recurring basis [Member]
Level 1 [Member]
Mar. 31, 2013
Fair Value on a recurring basis [Member]
Level 2 [Member]
Dec. 31, 2012
Fair Value on a recurring basis [Member]
Level 2 [Member]
Mar. 31, 2013
Fair Value on a recurring basis [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value on a recurring basis [Member]
Level 3 [Member]
Mar. 31, 2013
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Mar. 31, 2013
Fair Value on a nonrecurring basis [Member]
Level 3 [Member]
Mar. 31, 2013
Current assets - Fair market value of derivatives [Member]
Fair Value on a recurring basis [Member]
Level 1 [Member]
Dec. 31, 2012
Current assets - Fair market value of derivatives [Member]
Fair Value on a recurring basis [Member]
Level 1 [Member]
Mar. 31, 2013
Current assets - Fair market value of derivatives [Member]
Fair Value on a recurring basis [Member]
Level 2 [Member]
Dec. 31, 2012
Current assets - Fair market value of derivatives [Member]
Fair Value on a recurring basis [Member]
Level 2 [Member]
Mar. 31, 2013
Current assets - Fair market value of derivatives [Member]
Fair Value on a recurring basis [Member]
Level 3 [Member]
Dec. 31, 2012
Current assets - Fair market value of derivatives [Member]
Fair Value on a recurring basis [Member]
Level 3 [Member]
Mar. 31, 2013
Current assets - Fair market value of derivatives [Member]
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Current assets - Fair market value of derivatives [Member]
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Mar. 31, 2013
Other long-term assets [Member]
Fair Value on a recurring basis [Member]
Level 1 [Member]
Dec. 31, 2012
Other long-term assets [Member]
Fair Value on a recurring basis [Member]
Level 1 [Member]
Mar. 31, 2013
Other long-term assets [Member]
Fair Value on a recurring basis [Member]
Level 2 [Member]
Dec. 31, 2012
Other long-term assets [Member]
Fair Value on a recurring basis [Member]
Level 2 [Member]
Mar. 31, 2013
Other long-term assets [Member]
Fair Value on a recurring basis [Member]
Level 3 [Member]
Dec. 31, 2012
Other long-term assets [Member]
Fair Value on a recurring basis [Member]
Level 3 [Member]
Mar. 31, 2013
Other long-term assets [Member]
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Other long-term assets [Member]
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Mar. 31, 2013
Current Liabilities - Fair Market Value of Derivatives [Member]
Fair Value on a recurring basis [Member]
Level 1 [Member]
Dec. 31, 2012
Current Liabilities - Fair Market Value of Derivatives [Member]
Fair Value on a recurring basis [Member]
Level 1 [Member]
Mar. 31, 2013
Current Liabilities - Fair Market Value of Derivatives [Member]
Fair Value on a recurring basis [Member]
Level 2 [Member]
Dec. 31, 2012
Current Liabilities - Fair Market Value of Derivatives [Member]
Fair Value on a recurring basis [Member]
Level 2 [Member]
Mar. 31, 2013
Current Liabilities - Fair Market Value of Derivatives [Member]
Fair Value on a recurring basis [Member]
Level 3 [Member]
Dec. 31, 2012
Current Liabilities - Fair Market Value of Derivatives [Member]
Fair Value on a recurring basis [Member]
Level 3 [Member]
Mar. 31, 2013
Current Liabilities - Fair Market Value of Derivatives [Member]
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Current Liabilities - Fair Market Value of Derivatives [Member]
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Mar. 31, 2013
Other long-term liabilities [Member]
Fair Value on a recurring basis [Member]
Level 1 [Member]
Mar. 31, 2013
Other long-term liabilities [Member]
Fair Value on a recurring basis [Member]
Level 2 [Member]
Dec. 31, 2012
Other long-term liabilities [Member]
Fair Value on a recurring basis [Member]
Level 2 [Member]
Mar. 31, 2013
Other long-term liabilities [Member]
Fair Value on a recurring basis [Member]
Level 3 [Member]
Mar. 31, 2013
Other long-term liabilities [Member]
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Other long-term liabilities [Member]
Fair Value on a recurring basis [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Derivative Assets                                                                                  
Derivative Assets, Current $ 1,511 $ 1,674                   $ 0 $ 0 $ 1,511 $ 1,674 $ 0 $ 0 $ 1,511 $ 1,674                                            
Derivative Assets, Noncurrent                                       0 0 0 250 0 0 0 250                            
Derivative Assets     0 0 1,511 1,924 0 0 1,511 1,924                                                              
Derivative Liabilities                                                                                  
Derivative Liabilities, Current 537 125                                                   0 0 537 125 0 0 537 125            
Derivative Liabilities, Noncurrent                                                                       0 331 116 0 331 116
Derivative Liabilities     0 0 868 241 0 0 868 241                                                              
Derivative Assets (Liabilities), at Fair Value, Net     0 0 643 1,683 0 0 643 1,683                                                              
Asset Retirement Obligation, Fair Value Disclosure                     $ 360