|
Derivative Financial Instruments - Changes in Fair Value of Commodity Derivative Contracts Recognized in Earnings (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Gain Loss On Derivative Instruments Net Pretax [Abstract] | |||
| Derivative (gain) loss | $ (3,965)us-gaap_GainLossOnDerivativeInstrumentsNetPretax | $ 8,470us-gaap_GainLossOnDerivativeInstrumentsNetPretax | $ 13,954us-gaap_GainLossOnDerivativeInstrumentsNetPretax |
| X | ||||||||||
|
- Definition
Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|