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LONG-TERM DEBT AND LINES OF CREDIT - Effect on Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivatives in cash flow hedging relationships:        
Amount of net unrealized gains (losses) recognized in other comprehensive income $ (42,222) $ 2,932 $ (56,731) $ 10,508
Amount of net unrealized gains reclassified out of other comprehensive income to interest expense $ (893) $ (1,104) $ (2,723) $ (1,167)