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Fair Value of Financial Instruments (Fair Value of Financial Instruments, Non-Recurring Basis Measurements) (Narrative) (Details)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Other current liabilities, equity method investments (in dollars) $ 35,033 $ 35,033 $ 66,527
Pipeline Joint Ventures [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investment, ownership percentage 33.00% 33.00%  
Equity Method Investee [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Other current liabilities, equity method investments (in dollars) $ 1,300 $ 1,300 32,400
Equity Method Investee [Member] | Pipeline Joint Ventures [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Equity method investment, amount of investment (in dollars) $ 6,000 $ 6,000  
Number of equity method investments acquired 2    
Number of pipelines to be constructed 2 2  
Equity Method Investee [Member] | Pipeline Joint Ventures [Member] | Equity Contributions and/or Loan Guarantees [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Unconsolidated affiliates, outstanding commitments (in dollars) $ 78,000 $ 78,000  
Fair Value, Measurements, Non-Recurring [Member] | Carrying Amount [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Cost and equity method investments, including long-term receivables from investees and contractual joint ventures, aggregate carrying value (in dollars) $ 21,900 $ 21,900 17,700
Senior Notes [Member] | 4.875% Senior Notes [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Debt instrument, interest rate (percentage) 4.875% 4.875%  
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Level 1 [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
Fair value measurements, valuation techniques   the estimated fair value of the Company’s 4.875% Senior Notes, based on quoted market prices in active markets, a Level 1 input  
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Carrying Amount [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
4.875% Senior Notes (in dollars) $ 400,000 $ 400,000 400,000
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Fair Value [Member] | Level 1 [Member]      
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]      
4.875% Senior Notes (in dollars) $ 364,000 $ 364,000 $ 375,000