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Debt, Commitments and Contingencies - Debt (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 06, 2017
USD ($)
Mar. 07, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Aug. 10, 2016
USD ($)
Debt Instrument [Line Items]                
Repayments of credit facility         $ 74,700,000 $ 0 $ 0  
Connect And Piper                
Debt Instrument [Line Items]                
Amounts drawn under senior line of credit   $ 67,000,000            
Line of Credit | 2014 Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Current borrowing capacity               $ 75,000,000
Long-term debt $ 72,000,000         $ 6,700,000    
Amounts drawn under senior line of credit   $ 67,000,000            
Repayments of credit facility 72,000,000     $ 1,700,000        
Line of Credit | 2017 Facility | Revolving Credit Facility                
Debt Instrument [Line Items]                
Current borrowing capacity 125,000,000              
Long-term debt 72,000,000   $ 71,000,000   $ 71,000,000      
Repayments of credit facility     $ 1,000,000          
Maximum borrowing capacity $ 175,000,000              
Consolidated leverage ratio covenant (not to exceed)     3.5   3.5      
Unused line commitment fee (percent)         0.20%      
Effective interest rate (percent)         3.44% 2.82% 2.63%  
Consolidated fixed charge coverage ratio covenant (at least)         1.25      
Line of Credit | 2017 Facility | Revolving Credit Facility | Federal Funds rate                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)         0.50%      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)         1.00%      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario One, Leverage Ratio                
Debt Instrument [Line Items]                
Consolidated leverage ratio         1.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Two, Leverage Ratio | Minimum                
Debt Instrument [Line Items]                
Consolidated leverage ratio         1.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Two, Leverage Ratio | Maximum                
Debt Instrument [Line Items]                
Consolidated leverage ratio         2.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Three, Leverage Ratio | Minimum                
Debt Instrument [Line Items]                
Consolidated leverage ratio         2.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Three, Leverage Ratio | Maximum                
Debt Instrument [Line Items]                
Consolidated leverage ratio         3.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | LIBOR | Scenario Four, Leverage Ratio | Maximum                
Debt Instrument [Line Items]                
Consolidated leverage ratio         3.00      
Line of Credit | 2017 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Less Than 1.00 | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)         1.50%      
Line of Credit | 2017 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Greater Than Or Equal To 1.00 But Less Than 2.00 | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)         1.75%      
Line of Credit | 2017 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Greater Than Or Equal To 2.00 But Less Than 3.00 | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)         2.00%      
Line of Credit | 2017 Facility | Revolving Credit Facility | Consolidated Leverage Ratio, Greater Than Or Equal To 3.00 | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (percent)         2.50%