Assets Held-for-Sale and Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets held-for-sale
Assets held for sale	$ 136,677	$ 146,467
Oil and Gas
Assets held-for-sale
Assets held for sale	$ 136,700	$ 146,500

Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Name:	us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant