GOODWILL AND INTANGIBLE ASSETS, NET (Intangible Assets Components and Amortization Expense Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 109,030	$ 100,458
Accumulated amortization	(57,055)	(44,200)
Net  carrying amount	51,975	56,258
Amortization of purchased intangibles	$ 12,340	$ 9,914	$ 8,511
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	9 years	9 years
Gross carrying amount	$ 94,169	$ 87,489
Accumulated amortization	(49,415)	(38,526)
Net  carrying amount	44,754	48,963
Amortization of purchased intangibles	$ 10,478	$ 8,743	7,637
Software
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	6 years	6 years
Gross carrying amount	$ 6,309	$ 4,472
Accumulated amortization	(1,633)	(486)
Net  carrying amount	4,676	3,986
Amortization of purchased intangibles	$ 1,068	$ 486	0
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	5 years	5 years
Gross carrying amount	$ 6,495	$ 6,439
Accumulated amortization	(5,273)	(4,753)
Net  carrying amount	1,222	1,686
Amortization of purchased intangibles	$ 495	$ 447	266
Contract royalties
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	8 years	8 years
Gross carrying amount	$ 1,900	$ 1,900
Accumulated amortization	(673)	(435)
Net  carrying amount	1,227	1,465
Amortization of purchased intangibles	$ 238	$ 238	198
Assembled workforce
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	3 years	3 years
Gross carrying amount	$ 157	$ 158
Accumulated amortization	(61)	0
Net  carrying amount	96	158
Amortization of purchased intangibles	61	0	0
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangibles	$ 0	$ 0	$ 410