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Intangible Assets (Summary of Amortizing and Indefinite-Lived Intangibles) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Intangible Assets [Line Items] |  |
Intangible assets, gross | $ 1,067,725 | $ 1,067,725
Intangible assets, cumulative amortization | (41,134) | (40,505)
Intangible assets, cumulative impairment | (184,274) | (184,274)
Intangible assets, net | 842,317 | 842,946
Amortizing intangibles: |  |
Gross carrying value | 42,503 | 42,503
Cumulative amortization | (7,174) | (6,545)
Cumulative impairment losses | 0 | 0
Intangible assets, net | 35,329 | 35,958
Indefinite lived intangible assets: |  |
Gross carrying value | 1,025,222 | 1,025,222
Cumulative amortization | (33,960) | (33,960)
Cumulative impairment losses | (184,274) | (184,274)
Intangible assets, net | $ 806,988 | $ 806,988
Customer Relationships [Member] |  |
Amortizing intangibles: |  |
Weighted average life | 5 years | 5 years 2 months 13 days
Gross carrying value | $ 9,400 | $ 9,400
Cumulative amortization | (4,042) | (3,470)
Cumulative impairment losses | 0 | 0
Intangible assets, net | $ 5,358 | $ 5,930
Off-Market Favorable Lease [Member] |  |
Amortizing intangibles: |  |
Weighted average life | 37 years 9 months | 38 years
Gross carrying value | $ 11,730 | $ 11,730
Cumulative amortization | (3,132) | (3,075)
Cumulative impairment losses | 0 | 0
Intangible assets, net | 8,598 | 8,655
Development Agreement |  |
Amortizing intangibles: |  |
Gross carrying value | 21,373 | 21,373
Cumulative amortization | 0 | 0
Cumulative impairment losses | 0 | 0
Intangible assets, net | 21,373 | 21,373
Trademarks |  |
Indefinite lived intangible assets: |  |
Gross carrying value | 151,887 | 151,887
Cumulative amortization | 0 | 0
Cumulative impairment losses | (4,300) | (4,300)
Intangible assets, net | 147,587 | 147,587
Gaming License Rights |  |
Indefinite lived intangible assets: |  |
Gross carrying value | 873,335 | 873,335
Cumulative amortization | (33,960) | (33,960)
Cumulative impairment losses | (179,974) | (179,974)
Intangible assets, net | $ 659,401 | $ 659,401

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