Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Commitments And Contingencies (Funding Commitments By Third Parties Or Contingent Events) (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Recorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation $ 93,350
Purchase Obligation, Due in Second and Third Year 18,379
Purchase Obligation, Due in Fourth and Fifth Year 3,032
Purchase Obligation, Due after Fifth Year 0
Purchase Obligation 114,761
Letters Of Credit And Surety Bonds [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 13,618
Purchase Obligation, Due in Second and Third Year 60
Purchase Obligation, Due in Fourth and Fifth Year 0
Purchase Obligation, Due after Fifth Year 0
Purchase Obligation 13,678
Purchase Obligations [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Unrecorded Unconditional Purchase Obligation 79,732
Purchase Obligation, Due in Second and Third Year 18,319
Purchase Obligation, Due in Fourth and Fifth Year 3,032
Purchase Obligation, Due after Fifth Year 0
Purchase Obligation $ 101,083