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Long-Term Debt - Term Loan Facility (Details) - USD ($)
3 Months Ended 6 Months Ended 18 Months Ended
Jul. 23, 2018
Jul. 09, 2018
May 31, 2018
Jan. 24, 2017
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jul. 24, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                    
Long-term Debt           $ 488,887,000 $ 488,887,000     $ 469,736,000
Debt Instrument, Covenant, Tax Sharing Agreement, Distributions Percentage of Net Revenues, Maximum       1.00%            
Debt Instrument, Covenant, Repurchase of Capital Stock, Maximum       $ 1,000,000            
Term Loan Facility, Term A Loan [Member]                    
Debt Instrument [Line Items]                    
Proceeds from issuance of debt             9,000,000 $ 0    
Term Loan Facility, Term B Loan [Member]                    
Debt Instrument [Line Items]                    
Proceeds from issuance of debt             0 $ 441,871,000    
Montreign Operating [Member] | Notes Payable to Banks [Member] | Term Loan Facility, Term A Loan [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt           $ 7,300,000 $ 7,300,000      
Proceeds from issuance of debt     $ 9,000,000              
Stated percentage           6.98% 6.98%      
Debt Instrument, Repayment Percent of Principal           2.50% 2.50%      
Debt Instrument, Periodic Payment, Principal, First Year             $ 1,800,000      
Debt Instrument, Periodic Payment, Principal, Second Year and Thereafter             2,600,000      
Repayments of Debt           $ 1,800,000        
Montreign Operating [Member] | Notes Payable to Banks [Member] | Term Loan Facility, Term A Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       5.00%            
Montreign Operating [Member] | Notes Payable to Banks [Member] | Term Loan Facility, Term A Loan [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       4.00%            
Montreign Operating [Member] | Notes Payable to Banks [Member] | Term Loan Facility, Term B Loan [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt           $ 442,500,000 $ 442,500,000      
Stated percentage           10.34% 10.34%      
Debt Instrument, Repayment Percent of Principal           1.00% 1.00%      
Repayments of Debt           $ 1,100,000        
Debt Instrument, Periodic Payment, Principal             $ 1,100,000      
Montreign Operating [Member] | Notes Payable to Banks [Member] | Term Loan Facility, Term B Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       8.25%            
Montreign Operating [Member] | Notes Payable to Banks [Member] | Term Loan Facility, Term B Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum                    
Debt Instrument [Line Items]                    
Stated percentage       1.00%            
Montreign Operating [Member] | Notes Payable to Banks [Member] | Term Loan Facility, Term B Loan [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate       7.25%            
Subsequent Event | Montreign Operating [Member] | Notes Payable to Banks [Member] | Term Loan Facility, Term A Loan [Member]                    
Debt Instrument [Line Items]                    
Proceeds from issuance of debt $ 53,000,000 $ 8,000,000                
Commitment fee percent, after closing date                 5.00%  
Scenario, Forecast [Member]                    
Debt Instrument [Line Items]                    
Minimum Expected Occupancy Rate, Percentage         95.00%