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Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 395,826 | $ 395,692
Accumulated Amortization | 196,677 | 190,805
Carrying Value | 199,149 | 204,887
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 94,654 | 94,654
Accumulated Amortization | 90,441 | 89,756
Carrying Value | 4,213 | 4,898
Licensing agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 38,678 | 38,678
Accumulated Amortization | 34,785 | 34,204
Carrying Value | 3,893 | 4,474
Segment total |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 133,332 | 133,332
Accumulated Amortization | 125,226 | 123,960
Carrying Value | 8,106 | 9,372
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,430 | 35,430
Accumulated Amortization | 34,027 | 33,676
Carrying Value | 1,403 | 1,754
Intangibles associated with lease |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,260 | 13,260
Accumulated Amortization | 4,578 | 4,459
Carrying Value | 8,682 | 8,801
Segment total |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 48,690 | 48,690
Accumulated Amortization | 38,605 | 38,135
Carrying Value | 10,085 | 10,555
Marine contract intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,000 | 27,000
Accumulated Amortization | 7,650 | 6,300
Carrying Value | 19,350 | 20,700
Offshore pipeline contract intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 158,101 | 158,101
Accumulated Amortization | 13,868 | 11,788
Carrying Value | 144,233 | 146,313
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 28,703 | 28,569
Accumulated Amortization | 11,328 | 10,622
Carrying Value | $ 17,375 | $ 17,947

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