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Fair Value Measurements (Schedule of Carrying Value and Estimated Fair Value of Financial Instruments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Carrying Value | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Notes payable $ 9,926
Carrying Value | Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Contingent consideration liability 0
Carrying Value | Revolving credit facility | Secured | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Revolving credit facility 32,000
Carrying Value | Revolving credit facility | Unsecured | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Revolving credit facility 75,000
Estimated Fair Value | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Notes payable 9,926
Estimated Fair Value | Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Contingent consideration liability 0
Estimated Fair Value | Revolving credit facility | Secured | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Revolving credit facility 32,000
Estimated Fair Value | Revolving credit facility | Unsecured | Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Revolving credit facility $ 75,000