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 Jun. 30, 2014	770,600	$ 46	738,842	22,597	(3,673)	757,812	12,788
Ending balance, shares (in Shares) at Jun. 30, 2014		45,519
Stock-based compensation	2,806		2,806			2,806
Exercise of options by employees and directors	741		741			741
Exercise of options by employees and directors (in Shares)		58
Cash paid to noncontrolling interest	(254)						(254)
Cash dividend declared, per share	(5,003)			(5,003)		(5,003)
Other comprehensive income (loss), net of related taxes:
Increase in noncontrolling interest	257						257
Net income	31,102			30,688		30,688	414
Other comprehensive income (loss), net of related taxes:
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)	(4,088)				(4,088)	(4,088)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax)	(72)				(72)	(72)
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 Jun. 30, 2015	993,813	$ 49	845,173	59,155	(8,519)	895,858	97,955
Ending balance, shares (in Shares) at Jun. 30, 2015		49,002
Stock-based compensation	2,156		2,156			2,156
Exercise of options by employees and directors	3,966		3,966			3,966
Exercise of options by employees and directors (in Shares)		469
Share exchange with Parent (Note 1)	25,757	$ 3	25,754			25,757
Share exchange with Parent (Note 1) (in Shares)		2,996
Cash paid to noncontrolling interest	(432)						(432)
Cash dividend declared, per share	(6,830)			(6,830)		(6,830)
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:
Loss in respect of derivative instruments designated for cash flow hedge (net of related tax of $27)	46				46	46
Net income	25,540			$ 24,446		24,446	$ 1,094
Other comprehensive income (loss), net of related taxes:
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)	164				164	164
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (net of related tax)	$ (61)				$ (61)	$ (61)