Construction Contracts - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Construction Contracts [Line Items]
Construction contract revenue	$ 0	$ 23,253	$ 0	$ 23,253
Construction contract expense	0	23,253	0	23,253
Transmission Expansion Projects
Construction Contracts [Line Items]
Contract price		23,253		23,253
Construction contract revenue		23,253		23,253
Construction contract expense		$ 23,253		$ 23,253

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Contract price per construction agreement, including agreed upon revisions.

+ References

No definition available.

+ Details

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- Definition

The aggregate revenue from building and real estate development, which may include improvements (such as drainage, utilities, grading and subdividing) to a parcel of land, and general contracting services during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Definition

Costs incurred and are directly related to generating contract revenues.

+ References

+ Details

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