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Overview and Summary of Significant Accounting Policies - Revenue in Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Total revenue	$ 296,916	$ 358,163	$ 363,677	$ 277,428	$ 277,285	$ 339,099	$ 364,774	$ 325,807	$ 1,296,184	$ 1,306,965	$ 1,204,970
Calculated under Revenue Guidance in Effect before Topic 606
Revenue:
Total revenue										1,306,965	1,204,970
Exhibition and Event Services [Member] | Calculated under Revenue Guidance in Effect before Topic 606
Revenue:
Total revenue										967,352	881,137
Exhibits and Environments [Member] | Calculated under Revenue Guidance in Effect before Topic 606
Revenue:
Total revenue										165,745	170,469
Pursuit Services [Member] | Calculated under Revenue Guidance in Effect before Topic 606
Revenue:
Total revenue										$ 173,868	$ 153,364

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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-Name Accounting Standards Codification
-Topic 606
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