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Discontinued Operations and Business Realignment Costs - Summarized Operating Results (Details) - Premium and Holiday Events Business - Discontinued Operations, Disposed of by Means Other than Sale, Abandonment - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues $ 3,002 $ 871 $ 0
Costs and expenses (4,890) (721) 0
Income tax (expense) benefit 490 (59) 0
Net income (loss) from discontinued operations, net of tax $ (1,398) $ 91 $ 0