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Related Party Transactions (Details) (BGP Joint Venture [Member], Co-venturer [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
BGP Joint Venture [Member] \| Co-venturer [Member]
Property Subject to or Available for Operating Lease [Line Items]
Company's outstanding common stock owned by BGP, percent	14.40%
Related party transaction, revenues from transactions with related party	$ 2.9	$ 2.0
Receivables due from BGP	$ 3.1

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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