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Long-Term Debt - Credit Agreement (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2017
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt Instrument [Line Items]          
Principal amount     $ 465,909,000    
Repayment of term loan     936,000 $ 61,468,000  
Loss on extinguishment of long-term debt     0 $ (1,105,000)  
Collateral Pledged          
Debt Instrument [Line Items]          
Maximum percent of shares of foreign subsidiaries 66.00%        
Term Loan Maturing June 2020          
Debt Instrument [Line Items]          
Principal amount $ 100,000,000   $ 32,757,000   $ 33,693,000
Repayment of term loan   $ 61,000,000      
Interest rate (as a percent)     6.75%    
Frequency of periodic payment quarterly        
Loss on extinguishment of long-term debt   $ (900,000)      
Term Loan Maturing June 2020 | First Loan Year          
Debt Instrument [Line Items]          
Periodic principal payment (as a percent) 5.00%        
Term Loan Maturing June 2020 | Second Loan Year          
Debt Instrument [Line Items]          
Periodic principal payment (as a percent) 10.00%        
Term Loan Maturing June 2020 | Third Loan Year          
Debt Instrument [Line Items]          
Periodic principal payment (as a percent) 15.00%        
Term Loan Maturing June 2020 | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent) 3.25%        
Term Loan Maturing June 2020 | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent) 4.25%        
Term Loan and Revolving Loans          
Debt Instrument [Line Items]          
Maturity date Jun. 30, 2020        
Revolving Credit Facility Maturing June 2020          
Debt Instrument [Line Items]          
Borrowing capacity $ 150,000,000        
Additional commitments (up to) $ 100,000,000        
Available borrowing capacity     $ 147,300,000    
Letters of credit issued     $ 2,700,000    
Commitment fee percentage 0.50%        
Revolving Credit Facility Maturing June 2020 | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent) 1.75%        
Revolving Credit Facility Maturing June 2020 | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent) 3.25%        
Revolving Credit Facility Maturing June 2020 | LIBOR | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent) 2.75%        
Revolving Credit Facility Maturing June 2020 | LIBOR | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent) 4.25%        
Letter of Credit          
Debt Instrument [Line Items]          
Borrowing capacity $ 25,000,000