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, 2013
Recorded Unconditional Purchase Obligation [Line Items]  
Total Amounts Committed $ 177,389
Less Than 1 Year 109,171
1 - 3 Years 68,166
3 - 5 Years 52
More Than 5 Years 0
Letters Of Credit And Surety Bonds [Member]
  
Recorded Unconditional Purchase Obligation [Line Items]  
Total Amounts Committed 35,711
Less Than 1 Year 35,561
1 - 3 Years 150
3 - 5 Years 0
More Than 5 Years 0
Purchase Obligations [Member]
  
Recorded Unconditional Purchase Obligation [Line Items]  
Total Amounts Committed 141,678
Less Than 1 Year 73,610
1 - 3 Years 68,016
3 - 5 Years 52
More Than 5 Years $ 0