ACCUMULATED OTHER COMPREHENSIVE LOSS (Components of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Equity
Beginning balance	$ 1,096,282	$ 1,262,871	$ 1,475,639
Other comprehensive (loss) income before reclassifications	23,648	(144,057)	(88,471)
Amounts reclassified out of accumulated other comprehensive loss	0	0	(3,388)
Tax effects	16,918	7	573
Other comprehensive loss	40,566	(144,050)	(91,286)
Ending balance	1,084,241	1,096,282	1,262,871
Foreign Currency Translation Adjustments
Increase (Decrease) in Equity
Beginning balance	(252,939)	(108,889)	(20,164)
Other comprehensive (loss) income before reclassifications	23,967	(144,050)	(88,725)
Amounts reclassified out of accumulated other comprehensive loss	0	0	0
Tax effects	16,761	0	0
Other comprehensive loss	40,728	(144,050)	(88,725)
Ending balance	(212,211)	(252,939)	(108,889)
Unrealized Gains (Losses) on Available-for-Sale Securities
Increase (Decrease) in Equity
Beginning balance	0	0	1,904
Other comprehensive (loss) income before reclassifications	(535)	0	1,159
Amounts reclassified out of accumulated other comprehensive loss	0	0	(3,388)
Tax effects	214	0	325
Other comprehensive loss	(321)	0	(1,904)
Ending balance	(321)	0	0
Unfunded Pension Liability
Increase (Decrease) in Equity
Beginning balance	(1,953)	(1,953)	(1,296)
Other comprehensive (loss) income before reclassifications	216	(7)	(905)
Amounts reclassified out of accumulated other comprehensive loss	0	0	0
Tax effects	(57)	7	248
Other comprehensive loss	159	0	(657)
Ending balance	(1,794)	(1,953)	(1,953)
Accumulated Other Comprehensive loss
Increase (Decrease) in Equity
Beginning balance	(254,892)	(110,842)	(19,556)
Ending balance	$ (214,326)	$ (254,892)	$ (110,842)