Amount of receivables, net of billings in excess of costs, arising from transactions with related parties. Receivables are the amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Billings in excess of costs is the liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

No definition available.

Fair Value of Financial Instruments (Cost and Equity Investees) (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity in earnings (losses) of unconsolidated affiliates	$ 1,646,000	$ 3,066,000
Unrealized gains (losses) on equity investee activity, net of tax	636,000	(8,010,000)
Credit Facility [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued	$ 405,000,000		$ 314,300,000
Equity Investees [Member] \| Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of joint ventures	2
Construction projects, percentage complete	100.00%
Equity Investees [Member] \| Pacer [Member] \| Canadian Dollars [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity in earnings (losses) of unconsolidated affiliates		3,600,000
Net investment, equity investees, asset	$ 19,700,000		31,400,000
Other equity investee, proceeds related to ongoing liquidation	12,100,000
Equity Investees [Member] \| Pacer [Member] \| Canadian Dollars [Member] \| Equity Investees, Remaining Amounts Committed [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Contractual joint venture, additional amounts committed	$ 0
Waha JVs [Member] \| Equity Investees [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of pipelines, construction services	2
Number of pipelines in operation	1
Equity investee, equity and other contributions	$ 53,300,000	0
Revenue, related parties	151,400,000	10,300,000
Receivables, including retainage, net of BIEC, related parties	68,500,000		71,200,000
Net investment, equity investees, asset	64,000,000		6,000,000
Waha JVs [Member] \| Equity Investees [Member] \| Interest Rate Swaps [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Unrealized gains (losses) on equity investee activity	1,000,000	(13,000,000)
Unrealized gains (losses) on equity investee activity, net of tax	600,000	$ (8,000,000)
Waha JVs [Member] \| Equity Investees [Member] \| Other [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity in earnings (losses) of unconsolidated affiliates	1,600,000
Waha JVs [Member] \| Equity Investees [Member] \| Credit Facility [Member] \| Financial Standby [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued	36,000,000		$ 91,000,000
Joint Venture Liquidated in 2016 [Member] \| Equity Investees [Member] \| Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of joint ventures			1
Cost Investment [Member] \| CCP [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Cost method investment, original cost	$ 15,000,000