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Credit Facility and Convertible Debentures (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 15, 2019
May 31, 2018
Jul. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                              
Repayments of Lines of Credit                         $ 68,568,000 $ 16,433,000  
Interest Expense, Debt       $ 0 $ 5,806,000 $ 5,682,000 $ 2,535,000 $ 6,645,000 $ 3,310,000 $ 3,422,000 $ 2,690,000   14,023,000 16,067,000  
Debt Instrument, Gain (Loss) from Covenant Liability                       $ (5,100,000)      
Interest payments                         11,500,000 11,100,000  
Revolving Credit Facility [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Debt Covenants, Cash and Cash Equivalent Threshold   $ 50,000,000                          
Credit Facility [Member] | Revolving Credit Facility [Member] | Interest Rate Application A [Member] | London Interbank Offered Rate (LIBOR) [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate   8.50%                          
Credit Facility [Member] | Revolving Credit Facility [Member] | Interest Rate Application B [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate   2.00%                          
Credit Facility [Member] | Revolving Credit Facility [Member] | Interest Rate Application B [Member] | London Interbank Offered Rate (LIBOR) [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate   1.00%                          
Credit Facility [Member] | Revolving Credit Facility [Member] | Interest Rate Application B [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate   0.50%                          
Amended Credit Facility [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Debt Covenants, Cash and Cash Equivalent Threshold   $ 50,000,000           $ 50,000,000           50,000,000  
Repayments of Lines of Credit $ 24,000,000                            
Line of Credit Facility, Periodic Payment, Interest $ 2,900,000                            
Extinguishment of Debt, Amount     $ 44,500,000                        
Interest Expense, Debt     $ 4,100,000                        
Debt Instrument, Debt Covenants, Liquidity Threshold   20,000,000                          
Debt Instrument, Debt Covenants, Minimum Aggregate Appraised Value Plus Liquidity Threshold   350,000,000                          
Debt Instrument, Debt Covenant, Deployment Threshold   40,000,000.0                          
Debt Instrument, Debt Covenant, Expense Threshold   11,500,000.0                          
Long-term Line of Credit, Repayment Feature, Noncurrent   $ 500,000                          
Minimum [Member] | Credit Facility [Member] | Revolving Credit Facility [Member] | Interest Rate Application A [Member] | London Interbank Offered Rate (LIBOR) [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate   1.00%                          
Minimum [Member] | Credit Facility [Member] | Revolving Credit Facility [Member] | Interest Rate Application B [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate   7.50%                          
Line of Credit [Member] | Revolving Credit Facility [Member]                              
Debt Instrument [Line Items]                              
Interest Expense, Debt                         14,000,000 14,600,000  
Debt Instrument, Interest Rate, Effective Percentage         15.10%             15.10%      
Interest payments                         $ 11,500,000 $ 10,000,000  
Convertible Debt [Member]                              
Debt Instrument [Line Items]                              
Long-term Debt, Gross                             $ 41,000,000
Debt Instrument, Interest Rate, Stated Percentage                             5.25%