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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivatives in cash flow hedging relationships:        
Amount of unrealized gains (losses) recognized in other comprehensive income (loss) $ 2,932 $ (3,382) $ 10,508 $ (2,555)
Amount of unrealized (gains) losses reclassified out of other comprehensive income (loss) to interest expense $ (1,104) $ 1,897 $ (1,167) $ 3,493