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Debt Credit Agreement (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2018
USD ($)
Oct. 06, 2017
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]              
Secured Debt   $ 245,000,000          
Line of Credit Facility, Maximum Borrowing Capacity $ 175,000,000.0 25,000,000.0          
Revolving Credit Facility $ 83,200,000       $ 53,188,000 $ 0  
Repayments of Lines of Credit     $ 30,000,000 $ 10,000,000 40,000,000    
Proceeds from issuance of Revolving Credit Facility   $ 10,000,000     0 10,000,000 $ 0
(Loss) gain on extinguishment of debt         (8,262,000) 0 421,000
Line of Credit Facility, Commitment Fee Percentage 0.15%            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.30%            
Number Of Financial Covenants 2            
Consolidated Leverage Ratio 3.50            
Consolidated Fixed Charge Coverage Ratio 1.25            
Repayments of Debt         161,813,000    
Interest Expense, Debt         5,700,000 $ 10,900,000 $ 10,900,000
Amortization of Debt Issuance Costs         $ 800,000    
Federal Funds Effective Swap Rate [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Basis Spread on Variable Rate         0.005%    
Base Rate [Member]              
Debt Instrument [Line Items]              
Senior Credit Facility, applicable margin 1.00%            
London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Senior Credit Facility, applicable margin 2.00%            
Minimum [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Senior Credit Facility, applicable margin 0.75%            
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Senior Credit Facility, applicable margin 1.75%            
Maximum [Member]              
Debt Instrument [Line Items]              
Consolidated Leverage Ratio 4.50            
Maximum [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Senior Credit Facility, applicable margin 1.50%            
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Senior Credit Facility, applicable margin 2.50%            
Term Loan [Member]              
Debt Instrument [Line Items]              
(Loss) gain on extinguishment of debt         $ 6,000,000