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Debt - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
May 24, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Instrument [Line Items]          
Term loan   $ 148,500,000   $ 148,500,000  
Interest expense   3,071,000 $ 5,560,000 $ 6,132,000 $ 8,979,000
Secured Debt | 2018 Term Loan          
Debt Instrument [Line Items]          
Debt instrument face amount $ 150,000,000        
Debt instrument term (years) 5 years        
Interest rate during period (percent)       6.95%  
Frequency of periodic payment       Quarterly  
Periodic payment of principal       $ 375,000  
Interest expense   2,800,000   5,700,000  
Unamortized issuance costs   2,200,000   $ 2,200,000  
Debt instrument covenant, maximum debt-to-total capitalization ratio       35.00%  
Secured Debt | 2018 Term Loan | Eurodollar          
Debt Instrument [Line Items]          
Variable rate floor (percent)       1.00%  
Basis spread on variable rate (percent)       4.75%  
Senior Secured Debt | 2015 Term Loan          
Debt Instrument [Line Items]          
Debt instrument face amount $ 150,000,000        
Revolving Credit Facility | 2018 Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt instrument term (years) 3 years        
Credit facility borrowing capacity $ 85,000,000        
Borrowings outstanding   0   $ 0  
Commitment fee (percent)       0.40%  
Commitment fees in interest expense   100,000   $ 200,000  
Debt issuance costs $ 1,500,000        
Interest expense from amortization of debt issuance costs   100,000   300,000  
Remaining deferred issuance costs, net of accumulated amortization   $ 1,000,000.0   $ 1,000,000.0  
Debt instrument covenant, maximum debt-to-total capitalization ratio       35.00%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Commitment fee (percent)       0.30%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Commitment fee (percent)       0.60%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Base Rate          
Debt Instrument [Line Items]          
Variable rate floor (percent)       1.00%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)       1.00%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)       2.50%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Eurodollar          
Debt Instrument [Line Items]          
Variable rate floor (percent)       0.00%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Eurodollar | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)       2.00%  
Revolving Credit Facility | 2018 Revolving Credit Facility | Eurodollar | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate (percent)       3.50%