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Derivatives - Fair Value Measurements on Recurring Basis (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
2015 Swaps  
Derivatives, Fair Value [Line Items]  
Asset Fair Value $ 1,094
2015 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)  
Derivatives, Fair Value [Line Items]  
Asset Fair Value 0
2015 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)  
Derivatives, Fair Value [Line Items]  
Asset Fair Value 1,094
2015 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)  
Derivatives, Fair Value [Line Items]  
Asset Fair Value 0
2014 Swaps  
Derivatives, Fair Value [Line Items]  
Liability Fair Value (3,947)
2014 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)  
Derivatives, Fair Value [Line Items]  
Liability Fair Value 0
2014 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)  
Derivatives, Fair Value [Line Items]  
Liability Fair Value (3,947)
2014 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)  
Derivatives, Fair Value [Line Items]  
Liability Fair Value $ 0