Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v2.4.0.8
Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3个月结束
3月. 31, 2014
3月. 31, 2013
12月. 31, 2013
Fair Value, 资产 and 负债 Measured on Recurring and Nonrecurring Basis [Line Items]      
资产      $ 324
Asset retirement obligation capitalized 1,869 670  
Level 1 [Member] | Diamondback Energy LLC [Member]
     
Fair Value, 资产 and 负债 Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment in Diamondback 227,474    
Level 1 [Member] | Fixed Price Swaps [Member]
     
Fair Value, 资产 and 负债 Measured on Recurring and Nonrecurring Basis [Line Items]      
资产 0    
负债 0    
Level 2 [Member] | Diamondback Energy LLC [Member]
     
Fair Value, 资产 and 负债 Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment in Diamondback 0    
Level 2 [Member] | Fixed Price Swaps [Member]
     
Fair Value, 资产 and 负债 Measured on Recurring and Nonrecurring Basis [Line Items]      
资产 2,565    
负债 34,032    
三级[会员]
     
Fair Value, 资产 and 负债 Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset retirement obligation capitalized 1,900    
三级[会员] | Diamondback Energy LLC [Member]
     
Fair Value, 资产 and 负债 Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity investment in Diamondback 0    
三级[会员] | Fixed Price Swaps [Member]
     
Fair Value, 资产 and 负债 Measured on Recurring and Nonrecurring Basis [Line Items]      
资产 0    
负债 $ 0