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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivatives in cash flow hedging relationships:        
Amount of unrealized gains (losses) recognized in other comprehensive income (loss) $ 1,845 $ 341 $ 12,353 $ (2,214)
Amount of unrealized (gains) losses reclassified out of other comprehensive income (loss) to interest expense $ (1,663) $ 1,172 $ (2,830) $ 4,667