Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2014	45,537
Balance at Dec. 31, 2014	$ 46	$ 742,006	$ 41,539	$ (8,668)	$ 774,923	$ 11,823	$ 786,746
Stock-based compensation		3,077			3,077		3,077
Exercise of options by employees and directors (in shares)	502
Exercise of options by employees and directors		4,612			4,612		4,612
Share exchange with Parent (in shares)	2,996
Share exchange with Parent	$ 3	26,012			26,015		26,015
Cash paid to non controlling interest						(4,507)	(4,507)
Cash dividend declared			(9,772)		(9,772)		(9,772)
Issuance of shares to noncontrolling interest, net of transaction costs		71,291			71,291	85,470	156,761
Net income			96,585		96,585	2,616	99,201
Loss in respect of derivative instruments designated for cash flow hedge				68	68		68
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment				(4,154)	(4,154)		(4,154)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge				(90)	(90)		(90)
Balance (in shares) at Sep. 30, 2015	49,035
Balance at Sep. 30, 2015	$ 49	846,998	128,352	(12,844)	962,555	95,402	1,057,957
Balance (in shares) at Dec. 31, 2015	49,107
Balance at Dec. 31, 2015	$ 49	849,223	148,396	(7,667)	990,001	93,873	1,083,874
Stock-based compensation		3,383			3,383		3,383
Exercise of options by employees and directors (in shares)	528
Exercise of options by employees and directors	$ 1	7,249			7,250		7,250
Cash paid to non controlling interest						(10,622)	(10,622)
Cash dividend declared			(22,469)		(22,469)		(22,469)
Issuance of shares to noncontrolling interest, net of transaction costs						8,272	8,272
Net income			65,700		65,700	4,390	70,284
Loss in respect of derivative instruments designated for cash flow hedge				65	65		65
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment				(3,829)	(3,829)		(3,829)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge				(72)	(72)		(72)
Balance (in shares) at Sep. 30, 2016	49,635
Balance at Sep. 30, 2016	$ 50	$ 859,855	$ 191,627	$ (11,503)	$ 1,040,029	$ 95,913	$ 1,135,942