Amount of accounts receivable, 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				6 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Undistributed earnings from equity method investees	$ 3,300,000				$ 3,300,000
Equity in earnings (losses) of unconsolidated affiliates	6,060,000		$ 489,000		7,706,000	$ 3,555,000
Unrealized losses on equity investee activity, net of tax	2,730,000		4,577,000		2,095,000	12,587,000
Credit Facility [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued	$ 305,600,000				$ 305,600,000		$ 314,300,000
Equity Investees [Member] \| Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Construction projects, percentage complete	100.00%				100.00%
Investee [Member] \| Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of joint ventures								2
Investee [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
Revenue, related parties				$ 600,000
Net investment, equity investees	$ 14,300,000				$ 14,300,000		31,400,000
Other equity investee, proceeds related to ongoing liquidation		$ 12,100,000
Expense, change in expected recovery from investee	(5,800,000)
Investee [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				0
CCI [Member] \| Immediate Family Member of Management or Principal Owner [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Cost method investment, original cost	$ 15,000,000				$ 15,000,000
Waha JVs [Member] \| Equity Investees [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of pipelines in operation	2				2
Equity investee, equity and other contributions	$ 19,900,000				$ 73,300,000
Revenue, related parties	100,200,000		51,600,000		251,600,000	61,900,000
Receivables, including retainage, net of BIEC, related parties	54,100,000				54,100,000		71,200,000
Net investment, equity investees	107,000,000				107,000,000		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 losses on equity investee activity	4,400,000		7,500,000		3,400,000	20,500,000
Unrealized losses on equity investee activity, net of tax	2,700,000		4,600,000		2,100,000	$ 12,600,000
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	6,100,000		$ 500,000		7,700,000
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	$ 19,000,000				$ 19,000,000		$ 91,000,000
Joint Venture Liquidated in 2016 [Member] \| Investee [Member] \| Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of joint ventures							1