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Debt and Finance Lease Obligations - Schedule of Long-term Debt and Finance Lease Obligations (Parenthetical) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]      
Weighted average interest rate on long term debt 5.20%   4.50%
Fair value of debt $ 316.6   $ 228.6
Cash paid for interest on debt $ 5.7 $ 4.1  
Current revolving credit facility maturity period 1 year   1 year
FlyOver Iceland Credit Facility      
Debt Instrument [Line Items]      
Weighted average interest rate on long term debt 4.90%    
2018 Credit Agreement | Revolving Credit Facility      
Debt Instrument [Line Items]      
Interest rate on credit facility 4.10%   4.30%