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Debt (Cinemas 1, 2, 3 Term Loan And Line Of Credit) (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2016 USD ($) | Mar. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Contractual facility |  | $ 290,879 | $ 252,929 |
US Cinema 1, 2, 3 Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual facility | $ 15,000 | $ 18,978 | $ 19,086 |
Maturity date |  | Sep. 01, 2019 | Sep. 01, 2019 |
Interest rate |  |  |  | 3.25%
Line of credit facility, maximum borrowing capacity |  |  |  | $ 20,000
Number of extension options | item |  | 1 |  |
US Cinema 1, 2, 3 Term Loan [Member] | Sutton Hill Properties, LLC [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Ownership percentage by parent |  |  |  | 75.00%

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