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Other Assets - Narrative (Details) $ in Thousands, € in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Mar. 31, 2009 USD ($) | Mar. 31, 2009 EUR (€) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2014 USD ($)
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of ship |  |  |  |  |  |  | $ 0 |  | $ 230,000 |  |  |  |
Recognized deferred gain |  |  |  |  |  |  | 21,794 |  | 0 |  |  |  |
Proceeds from collection of advance to affiliate |  |  |  |  |  |  | $ 49,501 |  | 31,633 |  |  |  |
LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 1.195% |  |  |  |  |  |  |  |  |
Mein Schiff 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 23 years | 23 years |  |  |  |  |  |  |  |  |  |
TUI Cruises GmbH joint venture |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  | 50.00% |  |  | 50.00% |  |  | 50.00% |  |  |
Investments in entity |  |  |  | $ 550,700 |  |  | $ 550,700 |  |  |  | $ 624,500 |  |
Underlying equity in net assets |  |  |  | 370,400 |  |  | 370,400 |  |  |  | 422,800 |  |
Advances to affiliate |  |  |  | 179,500 |  |  | $ 179,500 |  |  | € 154.6 | 199,800 | € 166.5 |
Debt, guaranteed percentage |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Additional amount outstanding on line of credit provided to TUI Cruises |  |  |  | $ 46,000 |  |  | $ 46,000 |  |  | € 39.6 |  |  |
Repayments of related party debt | € |  |  |  |  |  |  |  | € 44.2 |  |  |  |  |
Proceeds from sale of ship |  | $ 290,900 | € 224.4 |  |  |  |  |  |  |  |  |  |
Deferred gain on sale of property |  | $ 35,900 |  |  |  |  |  |  |  |  |  |  |
Recognized deferred gain |  |  |  |  |  |  | $ 21,800 |  |  |  |  |  |
TUI Cruises GmbH joint venture | TUI cruise ships |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Restriction on reduction of current ownership interest (as a percent) |  |  |  | 37.55% |  |  | 37.55% |  |  | 37.55% |  |  |
TUI Cruises GmbH joint venture | Splendour of the Seas |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on loan provided to related party (as a percent) | 6.25% |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, term | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Debt, guaranteed percentage | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Pullmantur and CDF Croisieres de France |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  | 49.00% |  |  | 49.00% |  |  | 49.00% |  |  |
Advances to affiliate |  |  |  | $ 17,400 |  |  | $ 17,400 |  |  | € 15.0 |  |  |
Interest rate on loan provided to related party (as a percent) |  |  |  | 6.50% |  |  | 6.50% |  |  | 6.50% |  |  |
Debt, guaranteed percentage |  |  |  |  |  |  | 51.00% | 51.00% |  |  |  |  |
Retained ownership percentage of subsidiary after sale |  |  |  |  |  |  | 49.00% | 49.00% |  |  |  |  |
Maximum loss exposure |  |  |  | $ 59,200 |  |  | $ 59,200 |  |  |  | 53,700 |  |
Proceeds from credit facility |  |  |  | $ 8,700 |  |  | $ 8,700 |  |  | € 7.5 |  |  |
Percentage of subsidiary which has been sold |  |  |  | 51.00% |  |  | 51.00% |  |  | 51.00% |  |  |
Pullmantur and CDF Croisieres de France | Springwater Capital LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  | 51.00% |  |  | 51.00% |  |  | 51.00% |  |  |
Grand Bahamas Shipyard Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from collection of advance to affiliate |  |  |  |  |  |  | $ 14,200 |  | 4,200 |  |  |  |
Grand Bahamas Shipyard Ltd. | Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  | 40.00% |  |  | 40.00% |  |  | 40.00% |  |  |
Investments in entity |  |  |  | $ 55,900 |  |  | $ 55,900 |  |  |  | 49,400 |  |
Underlying equity in net assets |  |  |  | 40,700 |  |  | 40,700 |  |  |  | 32,400 |  |
Related party transaction, payment amount for ship repair and maintenance |  |  |  | 17,300 |  | $ 1,900 | 41,600 |  | $ 7,500 |  |  |  |
Grand Bahamas Shipyard Ltd. | Not Primary Beneficiary | Non-accrual status of advances to affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Advances to affiliate |  |  |  | $ 15,200 |  |  | $ 15,200 |  |  |  | 17,000 |  |
Interest rate on loan provided to related party (as a percent) |  |  |  | 5.50% |  |  | 5.50% |  |  | 5.50% |  |  |
Grand Bahamas Shipyard Ltd. | Not Primary Beneficiary | Non-accrual status of advances to affiliates | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 3.50% |  |  |  |  |  |  |  |  |
Skysea Holding |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  | $ 23,300 |  |  |  |  |  |  |  |
Skysea Holding | Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  | 37.00% |  |  | 37.00% |  |  | 37.00% |  |  | 37.00%
Investments in entity |  |  |  | $ 63,800 |  |  | $ 63,800 |  |  |  | 96,000 |  |
Underlying equity in net assets |  |  |  |  |  |  |  |  |  |  | 4,400 |  |
Advances to affiliate |  |  |  | $ 80,000 |  |  | $ 80,000 |  |  |  | $ 91,600 |  | $ 80,000
Interest rate on loan provided to related party (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 6.50%
Debt, guaranteed percentage |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |

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