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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash flow hedge gain (loss) amount reclassified to earnings $ 0 $ 0
Cash flow hedge gain (loss) on hedge ineffectiveness 0 0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap liability 183,000 210,000
Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap liability 183,000 210,000
Unsecured Debt | Senior Credit Facility, 2015    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term line of credit 300,000,000 300,000,000
Revolving Credit Facility | Senior Credit Facility    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term line of credit $ 0 $ 0