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Debt - Narrative (Details) - USD ($)
12 Months Ended
Oct. 23, 2014
Dec. 31, 2019
Dec. 31, 2018
Aug. 02, 2013
Debt Instrument [Line Items]        
Capital lease obligations     $ 1,071,000  
Letters of credit outstanding   $ 13,523,000    
Remaining borrowing capacity   186,477,000    
Finance lease assets   $ 555,000    
NET Services        
Debt Instrument [Line Items]        
Finance lease assets     1,894,000  
Capital leases, lessee balance sheet, accumulated depreciation     $ 673,000  
Minimum        
Debt Instrument [Line Items]        
Lease, term of contract   12 months    
Maximum        
Debt Instrument [Line Items]        
Lease, term of contract   36 months    
Credit Facility, Fourth Amendment, Term Loan Tranche        
Debt Instrument [Line Items]        
Available borrowing capacity, collateralized letters of credit   $ 25,000,000    
Credit Facility, Second Amendment, Term Loan Tranche | Minimum        
Debt Instrument [Line Items]        
Unused capacity, commitment fee percentage 0.25%      
Credit Facility, Second Amendment, Term Loan Tranche | Minimum | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.25%      
Credit Facility, Second Amendment, Term Loan Tranche | Minimum | Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.25%      
Credit Facility, Second Amendment, Term Loan Tranche | Maximum        
Debt Instrument [Line Items]        
Unused capacity, commitment fee percentage 0.50%      
Credit Facility, Second Amendment, Term Loan Tranche | Maximum | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate 3.25%      
Credit Facility, Second Amendment, Term Loan Tranche | Maximum | Base Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.25%      
Finance Lease Obligations | NET Services        
Debt Instrument [Line Items]        
Interest rate effective percentage   3.28%    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Face amount   $ 200,000,000    
Senior Credit Facility        
Debt Instrument [Line Items]        
Additional maximum borrowing capacity       $ 75,000,000
Percentage of pledge of stock   100.00%    
Letter of Credit | Minimum        
Debt Instrument [Line Items]        
Unused capacity, commitment fee percentage 2.25%      
Letter of Credit | Maximum        
Debt Instrument [Line Items]        
Unused capacity, commitment fee percentage 3.25%