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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill impairment charge | $ 0 |  |
Indefinite lived intangible assets impairment charge | 0 |  |
Net Cash Provided by (Used in) Investing Activities | $ (70,208,000) | $ (87,133,000) | $ (13,844,000)
Accounting Standards Update 2016-18 [Member] | Restatement Adjustment |  |  |
Net Cash Provided by (Used in) Investing Activities |  | $ 45,700,000 | $ (4,700,000)
Minimum [Member] |  |  |
Estimated useful lives | 3 years |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset | $ 40,000,000 |  |
Operating Lease, Liability | $ 40,000,000 |  |
Maximum [Member] |  |  |
Estimated useful lives | 40 years |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset | $ 50,000,000 |  |
Operating Lease, Liability | $ 50,000,000 |  |

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