Stock Compensation - Restricted Stock and Performance Share Grants (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Stock Compensation - Restricted Stock and Performance Share Grants (Textual) [Abstract]
Number of types of stock awards	3
Restricted Stock [Member]
Stock Compensation - Restricted Stock and Performance Share Grants (Textual) [Abstract]
Equity instrument other than options, issued	167,561
Equity instrument other than options, vested	132,814
Expenses relating to non-employee director stock compensation	$ 3,642,000
Employee stock compensation expensed	3,475,000	2,313,000
Employee stock compensation expense capitalized to projects	167,000
Restricted Stock [Member] \| Maximum [Member]
Stock Compensation - Restricted Stock and Performance Share Grants (Textual) [Abstract]
Vesting period of equity instrument other than options	4 years
Restricted Stock [Member] \| Minimum [Member]
Stock Compensation - Restricted Stock and Performance Share Grants (Textual) [Abstract]
Vesting period of equity instrument other than options	3 years
Performance Shares [Member] \| Maximum [Member]
Stock Compensation - Restricted Stock and Performance Share Grants (Textual) [Abstract]
Equity instrument other than options granted with stock awards range	614,158
Equity instrument other than options granted with stock awards threshold performance	906,044
Performance Shares [Member] \| Minimum [Member]
Stock Compensation - Restricted Stock and Performance Share Grants (Textual) [Abstract]
Equity instrument other than options granted with stock awards range	0
Equity instrument other than options granted with stock awards threshold performance	95,227
NDSI Plan [Member]
Stock Compensation - Restricted Stock and Performance Share Grants (Textual) [Abstract]
Vesting period of equity instrument other than options	1 year
Common stock under Stock Incentive Plan	200,000
Granted shares under stock incentive plan	83,518
NDSI Plan [Member] \| Restricted Stock [Member]
Stock Compensation - Restricted Stock and Performance Share Grants (Textual) [Abstract]
Common stock under Stock Incentive Plan	72,875
Granted shares under stock incentive plan	5,982
Expenses relating to non-employee director stock compensation	$ 183,000	$ 162,000

Employee stock compensation capitalized to projects.

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- Definition

Granted performance units with stock awards ranging shares.

+ References

No definition available.

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- Definition

Granted performance units with stock awards ranging threshold performance.

+ References

No definition available.

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- Definition

Number of share-based payment, equity instrument other than options, award.

+ References

No definition available.

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- Definition

Costs and payments related to employee benefits and equity-based compensation, such as pension expense and contributions, other postretirement benefits expense and payments, stock or unit options expense, and amortization of restricted stock or unit.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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- Definition

The amount of plan compensation cost recognized during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

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-Publisher AICPA

-Name Statement of Position (SOP)

-Number 93-6

-Paragraph 53

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 1

-Subparagraph (a)

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-Number 123R

-Paragraph 64, 65

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