Overview and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands			1 Months Ended	12 Months Ended
		Dec. 29, 2016 USD ($)	Jul. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Segment shares
Overview and Summary of Significant Accounting Policies [Line Items]
Number of reportable segments | Segment				3
Remaining maturities of highly-liquid investments				three months or less
Business interruption gain				$ 2,692
Share based compensation arrangements requisite service period				3 years
Percent of shares vest on the third anniversary of the grant				40.00%
Percent of increments over the subsequent two anniversary dates				30.00%
Decrease in tax expense	[1]			$ 8,000
Decrease in tax percentage	[1]			7.70%
ASU 2016-09
Overview and Summary of Significant Accounting Policies [Line Items]
Decrease in tax expense				$ 1,100
Decrease in tax percentage				1.10%
Liability Based Awards
Overview and Summary of Significant Accounting Policies [Line Items]
Share based compensation arrangements requisite service period				3 years
Equity Based Awards
Overview and Summary of Significant Accounting Policies [Line Items]
Share based compensation arrangements requisite service period				3 years
Other Restricted Stock
Overview and Summary of Significant Accounting Policies [Line Items]
Share based compensation arrangements requisite service period				5 years
Stock Options
Overview and Summary of Significant Accounting Policies [Line Items]
Share based compensation arrangements requisite service period				5 years
Stock options granted | shares				0
Glacier Park Inc
Overview and Summary of Significant Accounting Policies [Line Items]
Percentage of non-equity ownership related to non-redeemable noncontrolling interests				20.00%
Minimum | Restricted Stock
Overview and Summary of Significant Accounting Policies [Line Items]
Share based compensation arrangements vesting period				3 years
Maximum | Restricted Stock
Overview and Summary of Significant Accounting Policies [Line Items]
Share based compensation arrangements vesting period				5 years
Building | Minimum
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				15 years
Building | Maximum
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				40 years
Equipment | Minimum
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				3 years
Equipment | Maximum
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				12 years
Computer Software, Development Costs | Minimum
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				3 years
Computer Software, Development Costs | Maximum
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				10 years
Mount Royal Hotel
Overview and Summary of Significant Accounting Policies [Line Items]
Asset impairment loss		$ 2,200		$ 200
Property and business interruption insurance claims total			$ 36,300
Insurance proceeds allocated to insurance receivable				2,200
Impairment recoveries				29,300
Business interruption gain				2,500
Insurance settlements to offset non capitalized costs				1,300
Deferred revenue				$ 1,000
Pursuit
Overview and Summary of Significant Accounting Policies [Line Items]
Number of business lines | Segment				4

[1] Includes $0.6 million increase to the valuation allowance related to the remeasurement of deferred taxes due to the reduction in U.S. tax rate.