SIGNIFICANT ACCOUNTING POLICIES (Revision to Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2010
LONG-TERM LIABILITIES
Deferred income taxes, net	$ 27,453	$ 20,790
Total long-term liabilities	383,497	322,904
SHAREHOLDERS' EQUITY
Accumulated deficit	(181,525)	(198,589)
Total shareholders’ equity	254,990	270,976	250,295	241,828
Total liabilities and shareholders’ equity	756,230	698,108
As previously reported
LONG-TERM LIABILITIES
Deferred income taxes, net		18,881
Total long-term liabilities		320,995
SHAREHOLDERS' EQUITY
Accumulated deficit		(196,680)
Total shareholders’ equity		272,885
Total liabilities and shareholders’ equity		698,108
Adjustments
LONG-TERM LIABILITIES
Deferred income taxes, net		1,909				1,900
Total long-term liabilities		1,909
SHAREHOLDERS' EQUITY
Accumulated deficit		(1,909)			(1,900)
Total shareholders’ equity		(1,909)
Total liabilities and shareholders’ equity		$ 0