Consolidated Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2013	$ 745,111	$ 46	$ 735,295	$ (3,088)	$ 487	$ 732,740	$ 12,371
Beginning balance, shares (in Shares) at Dec. 31, 2013		45,461
Ending balance at Sep. 30, 2014	783,544	$ 46	740,651	36,835	(5,710)	771,822	11,722
Ending balance, shares (in Shares) at Sep. 30, 2014		45,531
Stock-based compensation	4,308		4,308			4,308
Exercise of options by employees and directors	889		889			889
Exercise of options by employees and directors (in Shares)		70
Cash paid to noncontrolling interest	(589)						(589)
Cash dividend declared, per share	(7,279)			(7,279)		(7,279)
Other comprehensive income (loss), net of related taxes:
Increase in noncontrolling interest	257						257
Acquisition of noncontrolling interest in Crump	(828)		159			159	(987)
Net income	47,872			47,202		47,202	670
Other comprehensive income (loss), net of related taxes:
Loss in respect of derivative instruments designated for cash flow hedge (net of related tax of $572)	(933)				(933)	(933)
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment (net of related tax of $0)	(5,157)				(5,157)	(5,157)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax)	(107)				(107)	(107)
Beginning balance at Dec. 31, 2014	786,746	$ 46	742,006	41,539	(8,668)	774,923	11,823
Beginning balance, shares (in Shares) at Dec. 31, 2014		45,537
Ending balance at Sep. 30, 2015	1,057,957	$ 49	846,998	128,352	(12,844)	962,555	95,402
Ending balance, shares (in Shares) at Sep. 30, 2015		49,035
Stock-based compensation	3,077		3,077			3,077
Exercise of options by employees and directors	4,612		4,612			4,612
Exercise of options by employees and directors (in Shares)		502
Share exchange with Parent (Note 1)	26,015	$ 3	26,012			26,015
Share exchange with Parent (Note 1) (in Shares)		2,996
Cash paid to noncontrolling interest	(4,507)						(4,507)
Cash dividend declared, per share	(9,772)			(9,772)		(9,772)
Issuance of shares to noncontrolling interest, net of transaction costs	156,761		$ 71,291			71,291	85,470
Other comprehensive income (loss), net of related taxes:
Net income	99,201			$ 96,585		96,585	$ 2,616
Other comprehensive income (loss), net of related taxes:
Loss in respect of derivative instruments designated for cash flow hedge (net of related tax of $572)	68				68	68
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment (net of related tax of $0)	(4,154)				(4,154)	(4,154)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax)	$ (90)				$ (90)	$ (90)