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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, 2019 | Dec. 31, 2018
Intangible Assets [Line Items] |  |
Intangible assets, gross | $ 1,686,875 | $ 1,705,575
Intangible assets, cumulative amortization | (61,602) | (54,631)
Intangible assets, cumulative impairment | (184,274) | (184,274)
Intangible assets, net | 1,440,999 | 1,466,670
Amortizing intangibles: |  |
Gross carrying value | 157,803 | 156,503
Cumulative amortization | (27,642) | (20,671)
Cumulative impairment losses | 0 | 0
Intangible assets, net | 130,161 | 135,832
Indefinite lived intangible assets: |  |
Gross carrying value | 1,529,072 | 1,549,072
Cumulative amortization | (33,960) | (33,960)
Cumulative impairment losses | (184,274) | (184,274)
Intangible assets, net | $ 1,310,838 | $ 1,330,838
Customer Relationships [Member] |  |
Amortizing intangibles: |  |
Weighted average life | 4 years | 7 years 3 months 24 days
Gross carrying value | $ 66,700 | $ 65,400
Cumulative amortization | (21,062) | (15,113)
Cumulative impairment losses | 0 | 0
Intangible assets, net | $ 45,638 | $ 50,287
Off-Market Favorable Lease [Member] |  |
Amortizing intangibles: |  |
Weighted average life | 36 years 9 months | 37 years
Gross carrying value | $ 11,730 | $ 11,730
Cumulative amortization | (3,358) | (3,302)
Cumulative impairment losses | 0 | 0
Intangible assets, net | 8,372 | 8,428
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
Other Intangible Assets [Member] |  |
Amortizing intangibles: |  |
Weighted average life | 14 years 2 months 24 days | 14 years 4 months 24 days
Gross carrying value | $ 58,000 | $ 58,000
Cumulative amortization | (3,222) | (2,256)
Cumulative impairment losses | 0 | 0
Intangible assets, net | 54,778 | 55,744
Trademarks |  |
Indefinite lived intangible assets: |  |
Gross carrying value | 207,387 | 207,387
Cumulative amortization | 0 | 0
Cumulative impairment losses | (4,300) | (4,300)
Intangible assets, net | 203,087 | 203,087
Gaming License Rights |  |
Indefinite lived intangible assets: |  |
Gross carrying value | 1,321,685 | 1,341,685
Cumulative amortization | (33,960) | (33,960)
Cumulative impairment losses | (179,974) | (179,974)
Intangible assets, net | $ 1,107,751 | $ 1,127,751

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