Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Funding Commitments By Third Parties Or Contingent Events) (Details)

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Commitments And Contingencies (Funding Commitments By Third Parties Or Contingent Events) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Recorded Unconditional Purchase Obligation [Line Items]  
Total Amounts Committed $ 132,011
Less Than 1 Year 116,091
1 - 3 Years 15,779
3 - 5 Years 141
More Than 5 Years 0
Letters Of Credit And Surety Bonds [Member]
  
Recorded Unconditional Purchase Obligation [Line Items]  
Total Amounts Committed 32,674
Less Than 1 Year 32,624
1 - 3 Years 50
3 - 5 Years 0
More Than 5 Years 0
Purchase Obligations [Member]
  
Recorded Unconditional Purchase Obligation [Line Items]  
Total Amounts Committed 99,337
Less Than 1 Year 83,467
1 - 3 Years 15,729
3 - 5 Years 141
More Than 5 Years $ 0