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Intangible Assets (Schedule Of Components Of Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 393,274 | $ 389,942
Accumulated Amortization | 172,488 | 166,496
Carrying Value | 220,786 | 223,446
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 94,654 | 94,654
Accumulated Amortization | 87,153 | 86,285
Carrying Value | 7,501 | 8,369
Licensing agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 38,678 | 38,678
Accumulated Amortization | 32,322 | 31,694
Carrying Value | 6,356 | 6,984
Segment total |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 133,332 | 133,332
Accumulated Amortization | 119,475 | 117,979
Carrying Value | 13,857 | 15,353
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 35,430 | 35,430
Accumulated Amortization | 32,452 | 32,044
Carrying Value | 2,978 | 3,386
Intangibles associated with lease |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,260 | 13,260
Accumulated Amortization | 4,104 | 3,986
Carrying Value | 9,156 | 9,274
Segment total |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 48,690 | 48,690
Accumulated Amortization | 36,556 | 36,030
Carrying Value | 12,134 | 12,660
Marine contract intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,000 | 27,000
Accumulated Amortization | 2,250 | 900
Carrying Value | 24,750 | 26,100
Offshore pipeline contract intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 158,101 | 158,101
Accumulated Amortization | 5,547 | 3,467
Carrying Value | 152,554 | 154,634
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 26,151 | 22,819
Accumulated Amortization | 8,660 | 8,120
Carrying Value | $ 17,491 | $ 14,699

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