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Financial Derivative Instruments (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Derivative [Line Items]      
Number of outstanding derivative instruments | contract 4    
Fair value $ 1,748   $ 2,069
Amortization amount from premiums paid 50    
Interest Rate Cap [Member]      
Derivative [Line Items]      
Notional Amount 90,000    
Premium Paid   $ 4,566  
3-month LIBOR Strike Rate   3.00%  
Effective percentage interest rate, maximum   3.00%  
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months $ 258