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DERIVATIVE INSTRUMENTS (Narrative) (Details) - Designated as Hedging Instrument [Member] - Cash Flow Hedges [Member] - Interest Rate Swap [Member]
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2007
USD ($)
agreement
Derivative [Line Items]          
Number of forward starting interest rate swap agreements | agreement         15
Notional amount of interest rate swap agreements         $ 1,500,000,000
Cash payments for interest rate swap agreements         $ 89,777,000
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period $ 344,000   $ 344,000    
Loss reclassified from AOCI $ 1,955,000 $ 507,000 3,022,000 $ 1,490,000  
Debt [Member]          
Derivative [Line Items]          
Loss reclassified from AOCI     $ 1,405,000