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Fair Values of Assets and Liabilities Summary of Fair Value Hierarchy for Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Nov. 30, 2005
May 31, 2005
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term Line of Credit $ 160,854 $ 83,184    
Amortizing debt facilities 65,384 57,982    
Notes Payable, Related Parties 40,000 40,000    
Convertible Debt, Fair Value Disclosures 61,393 60,791    
Liabilities carried at fair value        
Notes payable associated with structured financings, at fair value 9,240 12,276    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term Line of Credit 0 0    
Amortizing debt facilities 0 0    
Notes Payable, Related Parties 0 0    
Convertible Debt, Fair Value Disclosures 0 0    
Liabilities carried at fair value        
Notes payable associated with structured financings, at fair value 0 0    
Significant Other Observable Inputs (Level 2) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term Line of Credit 0 0    
Amortizing debt facilities 0 0    
Notes Payable, Related Parties 0 0    
Convertible Debt, Fair Value Disclosures 43,588 40,609    
Liabilities carried at fair value        
Notes payable associated with structured financings, at fair value 0 0    
Significant Unobservable Inputs (Level 3) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term Line of Credit 160,854 83,184    
Amortizing debt facilities 65,384 57,982    
Notes Payable, Related Parties 40,000 40,000    
Convertible Debt, Fair Value Disclosures 0 0    
Liabilities carried at fair value        
Notes payable associated with structured financings, at fair value $ 9,240 $ 12,276    
Five Point Eight Seven Five Percent Convertible Senior Notes Due Two Thousand Thirty Five [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage     5.875% 5.875%