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Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 395,939 | $ 395,692
Accumulated Amortization | 202,550 | 190,805
Carrying Value | 193,389 | 204,887
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 94,654 | 94,654
Accumulated Amortization | 91,125 | 89,756
Carrying Value | 3,529 | 4,898
Licensing agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 38,678 | 38,678
Accumulated Amortization | 35,366 | 34,204
Carrying Value | 3,312 | 4,474
Segment total |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 133,332 | 133,332
Accumulated Amortization | 126,491 | 123,960
Carrying Value | 6,841 | 9,372
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,430 | 35,430
Accumulated Amortization | 34,379 | 33,676
Carrying Value | 1,051 | 1,754
Intangibles associated with lease |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,260 | 13,260
Accumulated Amortization | 4,696 | 4,459
Carrying Value | 8,564 | 8,801
Segment total |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 48,690 | 48,690
Accumulated Amortization | 39,075 | 38,135
Carrying Value | 9,615 | 10,555
Marine contract intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,000 | 27,000
Accumulated Amortization | 9,000 | 6,300
Carrying Value | 18,000 | 20,700
Offshore pipeline contract intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 158,101 | 158,101
Accumulated Amortization | 15,949 | 11,788
Carrying Value | 142,152 | 146,313
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 28,816 | 28,569
Accumulated Amortization | 12,035 | 10,622
Carrying Value | $ 16,781 | $ 17,947

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