ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Summary of the changes in accumulated balances of other comprehensive income (loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			$ 975,730
Other comprehensive income/(loss) before reclassifications, net of taxes			7,849	$ 3,640
Realized (gains)/losses reclassified from accumulated other comprehensive income			(5,785)	(5)
Other comprehensive income (loss), net of tax	$ (2,700)	$ 1,638	2,064	3,635
Ending Balance	1,037,057		1,037,057
Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(236)	(578)
Other comprehensive income/(loss) before reclassifications, net of taxes			5	85
Realized (gains)/losses reclassified from accumulated other comprehensive income			6	484
Other comprehensive income (loss), net of tax			11	569
Ending Balance	(225)	(9)	(225)	(9)
Unrealized Gains (Losses) on Derivatives Designated as Hedging Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(692)	(1,091)
Other comprehensive income/(loss) before reclassifications, net of taxes			7,844	3,555
Realized (gains)/losses reclassified from accumulated other comprehensive income			(5,791)	(489)
Other comprehensive income (loss), net of tax			2,053	3,066
Ending Balance	1,361	1,975	1,361	1,975
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(928)	(1,669)
Ending Balance	$ 1,136	$ 1,966	$ 1,136	$ 1,966