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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2011
Accounting Policies [Abstract] |
Inventories |
| 2011 |  |  | 2010 |
| (In thousands)
Aggregates held for resale | $ | 78,518 |  |  | $ | 79,894 |
Materials and supplies | 61,611 |  |  | 57,324 |
Natural gas in storage (current) | 36,578 |  |  | 34,557 |
Asphalt oil | 32,335 |  |  | 25,234 |
Merchandise for resale | 32,165 |  |  | 30,182 |
Other | 32,998 |  |  | 25,706 |
Total | $ | 274,205 |  |  | $ | 252,897 |
Property, plant and equipment |
| 2011 |  |  | 2010 |  |  | Weighted Average Depreciable Life in Years |
| (Dollars in thousands, where applicable)
Regulated: |  |  |  |  |
Electric: |  |  |  |  |
Generation | $ | 546,783 |  |  | $ | 538,071 |  |  | 47 |
Distribution | 255,232 |  |  | 243,205 |  |  | 36 |
Transmission | 179,580 |  |  | 161,972 |  |  | 44 |
Other | 86,929 |  |  | 83,786 |  |  | 13 |
Natural gas distribution: |  |  |  |  |  |  |  |
Distribution | 1,257,360 |  |  | 1,223,239 |  |  | 38 |
Other | 311,506 |  |  | 285,606 |  |  | 23 |
Pipeline and energy services: |  |  |  |  |  |  |  |
Transmission | 386,227 |  |  | 357,395 |  |  | 52 |
Gathering | 42,378 |  |  | 41,931 |  |  | 19 |
Storage | 41,908 |  |  | 33,967 |  |  | 51 |
Other | 36,179 |  |  | 33,938 |  |  | 29 |
Nonregulated: |  |  |  |  |  |  |  |
Pipeline and energy services: |  |  |  |  |  |  |  |
Gathering | 198,864 |  |  | 203,064 |  |  | 17 |
Other | 13,735 |  |  | 13,512 |  |  | 10 |
Exploration and production: |  |  |  |  |  |  |  |
Natural gas and oil properties | 2,577,576 |  |  | 2,320,967 |  |  | * |
Other | 37,570 |  |  | 35,971 |  |  | 9 |
Construction materials and contracting: |  |  |  |  |  |  |  |
Land | 126,790 |  |  | 124,018 |  |  | — |
Buildings and improvements | 67,627 |  |  | 65,003 |  |  | 20 |
Machinery, vehicles and equipment | 902,136 |  |  | 899,365 |  |  | 12 |
Construction in progress | 8,085 |  |  | 4,879 |  |  | — |
Aggregate reserves | 395,214 |  |  | 393,110 |  |  | ** |
Construction services: |  |  |  |  |  |  |  |
Land | 4,706 |  |  | 4,526 |  |  | — |
Buildings and improvements | 15,001 |  |  | 14,101 |  |  | 22 |
Machinery, vehicles and equipment | 95,891 |  |  | 94,252 |  |  | 7 |
Other | 9,198 |  |  | 10,061 |  |  | 4 |
Other: |  |  |  |  |  |  |  |
Land | 2,837 |  |  | 2,837 |  |  | — |
Other | 46,910 |  |  | 29,727 |  |  | 24 |
Less accumulated depreciation, depletion and amortization | 3,361,208 |  |  | 3,103,323 |  |  |  |
Net property, plant and equipment | $ | 4,285,014 |  |  | $ | 4,115,180 |  |  |  |
* Amortized on the units-of-production method based on total proved reserves at an Mcf equivalent average rate of $2.04, $1.77 and $1.64 for the years ended December 31, 2011, 2010 and 2009, respectively. Includes natural gas and oil properties accounted for under the full-cost method, of which $232.5 and $182.4 million were excluded from amortization at December 31, 2011 and 2010, respectively. ** Depleted on the units-of-production method.
Summary of natural gas and oil properties not subject to amortization | The following table summarizes the Company's natural gas and oil properties not subject to amortization at December 31, 2011, in total and by the year in which such costs were incurred:
|  |  | Year Costs Incurred
| Total |  |  | 2011 |  |  | 2010 |  |  | 2009 |  |  | 2008 and prior |
| (In thousands)
Acquisition | $ | 185,773 |  |  | $ | 50,721 |  |  | $ | 71,315 |  |  | $ | 988 |  |  | $ | 62,749 |
Development | 9,938 |  |  | 9,689 |  |  | 156 |  |  | 2 |  |  | 91 |
Exploration | 27,439 |  |  | 24,389 |  |  | 2,710 |  |  | 72 |  |  | 268 |
Capitalized interest | 9,312 |  |  | 3,539 |  |  | 3,096 |  |  | 44 |  |  | 2,633 |
Total costs not subject to amortization | $ | 232,462 |  |  | $ | 88,338 |  |  | $ | 77,277 |  |  | $ | 1,106 |  |  | $ | 65,741 |
Schedule of Earnings Per Share Reconciliation [Table Text Block] | Net income was the same for both the basic and diluted earnings per share calculations. A reconciliation of the weighted average common shares outstanding used in the basic and diluted earnings per share calculation was as follows:
| 2011 |  | 2010 |  | 2009 |  | *
| (In thousands) |
Weighted average common shares outstanding - basic | 188,763 |  | 188,137 |  | 185,175 |  |
Effect of dilutive stock options and performance share awards | 142 |  | 92 |  | — |  |
Weighted average common shares outstanding - diluted | 188,905 |  | 188,229 |  | 185,175 |  |
* Due to the loss on common stock, 825 outstanding stock options, 18 restricted stock grants and 656 performance share awards were excluded from the computation of diluted loss per common share as their effect was antidilutive.
Cash expenditures for interest and income taxes | Cash expenditures for interest and income taxes were as follows:
Years ended December 31, | 2011 |  |  | 2010 |  |  | 2009 |
| (In thousands)
Interest, net of amount capitalized | $ | 78,133 |  |  | $ | 80,962 |  |  | $ | 81,267 |
Income taxes paid (refunded), net | $ | (12,287 | ) |  | $ | 46,892 |  |  | $ | 39,807 |
Components of other comprehensive income (loss) and their related tax effects | The components of other comprehensive loss, and their related tax effects for the years ended December 31 were as follows:
| 2011 |  |  | 2010 |  |  | 2009 |
| (In thousands)
Other comprehensive loss: |  |  |  |  |
Net unrealized gain (loss) on derivative instruments qualifying as hedges: |  |  |  |  |
Net unrealized gain (loss) on derivative instruments arising during the period, net of tax of $4,683, $(1,867) and $(2,509) in 2011, 2010 and 2009, respectively | $ | 7,900 |  |  | $ | (3,077 | ) |  | $ | (4,094 | )
Less: Reclassification adjustment for gain (loss) on derivative instruments included in net income, net of tax of $0, $(2,305) and $29,170 in 2011, 2010 and 2009, respectively | — |  |  | (3,750 | ) |  | 47,590 |
Net unrealized gain (loss) on derivative instruments qualifying as hedges | 7,900 |  |  | 673 |  |  | (51,684 | )
Postretirement liability adjustment, net of tax of $(13,573), $(3,609) and $6,291 in 2011, 2010 and 2009, respectively | (22,427 | ) |  | (5,730 | ) |  | 9,918 |
Foreign currency translation adjustment, net of tax of $(832), $(3,486) and $6,814 in 2011, 2010 and 2009, respectively | (1,295 | ) |  | (5,371 | ) |  | 10,568 |
Net unrealized gains on available-for-sale investments, net of tax of $44 in 2011 | 82 |  |  | — |  |  | — |
Total other comprehensive loss | $ | (15,740 | ) |  | $ | (10,428 | ) |  | $ | (31,198 | )
After-tax components of accumulated other comprehensive income (loss) | The after-tax components of accumulated other comprehensive loss as of December 31, 2011, 2010 and 2009, were as follows:
| Net Unrealized Gain (Loss) on Derivative Instruments Qualifying as Hedges |  |  | Postretirement Liability Adjustment |  |  | Foreign Currency Translation Adjustment |  |  | Net Unrealized Gains on Available-for-sale Investments |  |  | Total Accumulated Other Comprehensive Loss |
| (In thousands)
Balance at December 31, 2009 | $ | (2,298 | ) |  | $ | (25,163 | ) |  | $ | 6,628 |  |  | $ | — |  |  | $ | (20,833 | )
Balance at December 31, 2010 | $ | (1,625 | ) |  | $ | (30,893 | ) |  | $ | 1,257 |  |  | $ | — |  |  | $ | (31,261 | )
Balance at December 31, 2011 | $ | 6,275 |  |  | $ | (53,320 | ) |  | $ | (38 | ) |  | $ | 82 |  |  | $ | (47,001 | )

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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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