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Long-Term Debt (Narrative) (Details)
3 Months Ended
Feb. 09, 2016
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Covenant To Actual Ratios [Line Items]          
Revolving credit facility, maximum borrowing capacity       $ 300,000,000  
Revolving credit facility present accordion provisions       $ 75,000,000  
Term Number Two [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)       3.5  
Ratio Minimum Per Covenant [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Ratio of earnings to fixed cost obligations (in Ratio)       1.2  
Ratio Actual [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)       3.05  
Ratio of earnings to fixed cost obligations (in Ratio)       2.54  
Revolving Credit Facility [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Line of Credit Facility, Current Borrowing Capacity $ 150,000,000        
Line of Credit Facility, Potential Increase to Borrowing Capacity 75,000,000        
Revolving credit facility, maximum borrowing capacity       $ 150,000,000  
Credit Facility, Term Note [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Line of Credit Facility, Current Borrowing Capacity $ 150,000,000        
Repayments of Lines of Credit       2,810,000  
Term Loan [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Revolving credit facility, maximum borrowing capacity       150,000,000  
Credit Agreement [Member] | Revolving Credit Facility [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Amount drawn under term loan facility       $ 54,000,000  
Credit Agreement [Member] | Revolving Credit Facility [Member] | QTD [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Weighted average interest rate       2.70%  
Credit Agreement [Member] | Term Loan [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Amount drawn under term loan facility       $ 147,200,000  
Letters of credit issued and outstanding       0  
Line of Credit [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Debt Instrument, Change in Basis Spread on Variable Rate (3750.00%)        
Number of Days Prior to the Maturity of Subordinated Debt the Credit Agreement Matures 91 days        
Convertible Subordinated Notes [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Carrying value of the liability component $ 143,750,000     $ 116,278,000 $ 115,227,000
Write off of Deferred Debt Issuance Cost $ 570,000        
Forecast | Credit Facility, Term Note [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Repayments of Lines of Credit   $ 4,690,000 $ 3,750,000    
Prime Rate Option [Member] | Line of Credit [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Debt Instrument, Basis Spread on Variable Rate       1.125%  
Libor Margin Option [Member] | Line of Credit [Member]          
Debt Covenant To Actual Ratios [Line Items]          
Debt Instrument, Basis Spread on Variable Rate       2.125%