|
Segment Information Depreciation and Amortization, by Segment (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2013
|
Mar. 31, 2012
|
|
| Property, Plant and Equipment [Line Items] | ||
| Depreciation and amortization | $ 24,757 | $ 27,227 |
|
Energy Operating Segment [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Depreciation and amortization | 18,471 | 20,656 |
|
Water Operating Segment [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Depreciation and amortization | 6,269 | 6,556 |
|
Corporate Unallocated [Member]
|
||
| Property, Plant and Equipment [Line Items] | ||
| Depreciation and amortization | $ 17 | $ 15 |