Related Party Transactions (Investments) (Narrative) (Details) (Cross Country Pipeline [Member], Management [Member], USD $)			3 Months Ended	6 Months Ended
Jun. 30, 2014 Cost Method Investments [Member]	Dec. 31, 2013 Cost Method Investments [Member]	Jun. 30, 2014 Lease Agreements [Member] Equipment [Member]	Jun. 30, 2014 Lease Agreements [Member] Equipment [Member]
Related Party Transaction [Line Items]
Cost method investment, original cost		$ 15,000,000
Cost method investment, ownership percentage	14.85%
Expenses from transactions with related party			$ 1,800,000	$ 2,700,000

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration