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Debt - Credit and Security Agreement (Details)
12 Months Ended
Nov. 20, 2017
USD ($)
May 14, 2014
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2017
Aug. 21, 2015
USD ($)
Aug. 19, 2015
USD ($)
May 31, 2015
USD ($)
2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.10              
Line of Credit Facility [Line Items]              
Fixed charge coverage ratio             1.10
2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio remains at 1.15              
Line of Credit Facility [Line Items]              
Fixed charge coverage ratio             1.15
2014 Credit Agreement, Fourth Amendment              
Line of Credit Facility [Line Items]              
Letter of credit exposure outstanding           $ 17,000,000.0  
Minimum | 2014 Credit Agreement, Third Amendment | Herley disposition proceeds reinvestment reserve, as defined in the amendment              
Line of Credit Facility [Line Items]              
Covenant terms, percentage of reinvestment in excess of loans and credit (percent)             0.00%
Minimum | 2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.10              
Line of Credit Facility [Line Items]              
Covenant terms, percentage of reinvestment in excess of loans and credit (percent)             15.00%
Maximum | 2014 Credit Agreement, Third Amendment | Herley disposition proceeds reinvestment reserve, as defined in the amendment              
Line of Credit Facility [Line Items]              
Covenant terms, percentage of reinvestment in excess of loans and credit (percent)             15.00%
Maximum | 2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.10              
Line of Credit Facility [Line Items]              
Covenant terms, percentage of reinvestment in excess of loans and credit (percent)             25.00%
Revolving Credit Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   $ 110,000,000.0     $ 110,000,000.0    
Debt term   5 years          
Potential maximum borrowing capacity, subject to Lender approval   $ 135,000,000.0          
Outstanding borrowings     $ 0   $ 41,000,000    
Remaining borrowing capacity     $ 65,800,000        
Revolving Credit Facility | 2014 Credit Agreement, Third Amendment              
Line of Credit Facility [Line Items]              
Fixed charge coverage ratio   1.15          
Revolving Credit Facility | Amendment Credit Agreement              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity $ 90,000,000.0            
Debt term 5 years            
Potential maximum borrowing capacity, subject to Lender approval $ 115,000,000.0            
Percentage of Borrowing Base or Total Commitment Amount, less than       50.00%      
Revolving Credit Facility | Minimum | 2014 Credit Agreement, Third Amendment | Herley              
Line of Credit Facility [Line Items]              
Minimum amount required to repurchase             $ 175,000,000
Revolving Credit Facility | Federal Funds Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent)     0.50%        
Revolving Credit Facility | LIBOR Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent)     1.00%        
Revolving Credit Facility | Base Rate | Minimum              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent)     1.00%        
Revolving Credit Facility | Base Rate | Maximum              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent)     1.50%        
Revolving Credit Facility | Eurodollar Rate | Minimum              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent)     2.00%        
Revolving Credit Facility | Eurodollar Rate | Maximum              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent)     2.50%        
Letter of Credit              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   $ 50,000,000.0          
Outstanding borrowings     $ 9,500,000        
Letter of Credit | 2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio not measured              
Line of Credit Facility [Line Items]              
Covenant terms, capacity of outstanding loans of credit             $ 17,000,000.0
Letter of Credit | Amendment Credit Agreement              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity 50,000,000.0            
Swing Line Loan              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   $ 10,000,000.0          
Swing Line Loan | Amendment Credit Agreement              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity $ 10,000,000.0            
Revolving Loans plus outstanding Swingline Loans plus Letters of Credit | 2014 Credit Agreement, Third Amendment | Fixed charge coverage ratio of at least 1.05              
Line of Credit Facility [Line Items]              
Fixed charge coverage ratio             1.05
Covenant terms, capacity of outstanding loans of credit             $ 17,000,000.0