GOODWILL AND INTANGIBLE ASSETS, NET (Intangible Assets Components and Amortization Expense Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 100,458	$ 91,553
Accumulated amortization	(44,200)	(34,488)
Net carrying amount	56,258	57,065
Amortization of purchased intangibles	$ 9,914	$ 8,511	$ 7,562
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	9 years	9 years 6 months
Gross carrying amount	$ 87,489	$ 78,042
Accumulated amortization	(38,526)	(29,580)
Net carrying amount	48,963	48,462
Customer relationships | Depreciation and Amortization Expense
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangibles	$ 8,743	7,637	6,643
Software
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	6 years
Gross carrying amount	$ 4,472
Accumulated amortization	(486)
Net carrying amount	3,986
Software | Depreciation and Amortization Expense
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangibles	$ 486	$ 0	0
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	5 years	5 years 3 months 18 days
Gross carrying amount	$ 6,439	$ 6,111
Accumulated amortization	(4,753)	(4,300)
Net carrying amount	1,686	1,811
Trade names | Depreciation and Amortization Expense
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangibles	$ 447	$ 266	896
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	(435)	(198)
Net carrying amount	1,465	1,702
Contract royalties | Depreciation and Amortization Expense
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangibles	$ 238	$ 198	0
Assembled workforce
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)	3 years
Gross carrying amount	$ 158
Accumulated amortization	0
Net carrying amount	158
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Weighted average life at acquisition (in years)		11 years 2 months 12 days
Gross carrying amount		$ 5,500
Accumulated amortization		(410)
Net carrying amount		5,090
Favorable lease | Selling, General and Administrative Expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangibles	0	410	0
Non-competition agreements | Depreciation and Amortization Expense
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangibles	$ 0	$ 0	$ 23