CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]		Additional paid in capital [Member]	Accumulated other comprehensive loss [Member]	Retained earnings [Member]	Total	Non-controlling interests [Member]	Stockholders Equity
Balance at Dec. 31, 2017	$ 4		$ 331,902	$ (611)	$ 66,172	$ 397,467		$ 397,467
Balance (in shares) at Dec. 31, 2017	43,812,601
Cumulative effect of adopting new accounting standard					(3,872)	(3,872)		(3,872)
Issuance of Common Stock upon exercise of employee and non-employees stock-based awards		[1]	4,605			4,605		4,605
Issuance of Common Stock upon exercise of employee and non-employee stock options, shares	1,084,507
Equity based compensation expenses to employees and non-employee consultants			6,849			6,849		6,849
Other comprehensive income (loss) adjustments				(524)		(524)		(524)
Net income					35,686	35,686		35,686
Balance at Mar. 31, 2018	$ 4		343,356	(1,135)	97,986	440,211		440,211
Balance (in shares) at Mar. 31, 2018	44,897,108
Balance at Dec. 31, 2017	$ 4		331,902	(611)	66,172	397,467		397,467
Balance (in shares) at Dec. 31, 2017	43,812,601
Change to non-controlling interests
Net income						70,254
Balance at Jun. 30, 2018	$ 5		353,470	(1,138)	132,554	484,891		484,891
Balance (in shares) at Jun. 30, 2018	45,498,414
Balance at Mar. 31, 2018	$ 4		343,356	(1,135)	97,986	440,211		440,211
Balance (in shares) at Mar. 31, 2018	44,897,108
Issuance of Common Stock upon exercise of employee and non-employees stock-based awards		[1]	2,986			2,986		2,986
Issuance of Common Stock upon exercise of employee and non-employee stock options, shares	601,306
Equity based compensation expenses to employees and non-employee consultants			7,128			7,128		7,128
Other comprehensive income (loss) adjustments				(3)		(3)		(3)
Net income					34,568	34,568		34,568
Balance at Jun. 30, 2018	$ 5		353,470	(1,138)	132,554	484,891		484,891
Balance (in shares) at Jun. 30, 2018	45,498,414
Balance at Dec. 31, 2018	$ 5		371,794	(524)	191,133	562,408	$ 8,318	570,726
Balance (in shares) at Dec. 31, 2018	46,052,802
Issuance of Common Stock upon exercise of employee and non-employees stock-based awards		[1]	309			309		309
Issuance of Common Stock upon exercise of employee and non-employee stock options, shares	254,515
Equity based compensation expenses to employees and non-employee consultants			9,704			9,704		9,704
Consideration in common stock related to business combination		[1]	34,601			34,601		34,601
Consideration in common stock related to business combination, shares	1,194,046
Non-controlling interests related to business combination							67,734	67,734
Change to non-controlling interests			977			977	(2,964)	(1,987)
Other comprehensive income (loss) adjustments				(696)		(696)	(849)	(1,545)
Net income					19,016	19,016	(1,041)	17,975
Balance at Mar. 31, 2019	$ 5		417,385	(1,220)	210,149	626,319	71,198	697,517
Balance (in shares) at Mar. 31, 2019	47,501,363
Balance at Dec. 31, 2018	$ 5		371,794	(524)	191,133	562,408	8,318	570,726
Balance (in shares) at Dec. 31, 2018	46,052,802
Change to non-controlling interests						66,474
Net income						52,144
Balance at Jun. 30, 2019	$ 5		431,684	(895)	243,277	674,071	5,977	680,048
Balance (in shares) at Jun. 30, 2019	47,967,425
Balance at Mar. 31, 2019	$ 5		417,385	(1,220)	210,149	626,319	71,198	697,517
Balance (in shares) at Mar. 31, 2019	47,501,363
Issuance of Common Stock upon exercise of employee and non-employees stock-based awards			3,455			3,455		3,455
Issuance of Common Stock upon exercise of employee and non-employee stock options, shares	466,062
Equity based compensation expenses to employees and non-employee consultants			11,372			11,372		11,372
Non-controlling interests related to business combination			(528)			(528)	(65,551)	(66,079)
Other comprehensive income (loss) adjustments				325		325	545	870
Net income					33,128	33,128	(215)	32,913
Balance at Jun. 30, 2019	$ 5		$ 431,684	$ (895)	$ 243,277	$ 674,071	$ 5,977	$ 680,048
Balance (in shares) at Jun. 30, 2019	47,967,425

[1] Represents an amount lower than $1.