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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of effect on other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivatives in cash flow hedging relationships:        
Amount of loss recognized in other comprehensive income $ (3,382) $ (5,276) $ (2,555) $ (16,094)
Amount reclassified out of other comprehensive income to interest expense $ 1,897 $ 1,925 $ 3,493 $ 3,880