SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income by component (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (124,296)
Other comprehensive income before reclassifications	(45,940)
Amounts reclassified from accumulated other comprehensive income (loss)	4,425
Balance at end of period	(165,811)
Defined benefit plans adjustment | Pension
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(36,065)
Other comprehensive income before reclassifications	(576)
Amounts reclassified from accumulated other comprehensive income (loss)	3,301
Balance at end of period	(33,340)
Defined benefit plans adjustment | Postretirement Medical Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(39,716)
Amounts reclassified from accumulated other comprehensive income (loss)	981
Balance at end of period	(38,735)
Available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	413
Other comprehensive income before reclassifications	(1,438)
Amounts reclassified from accumulated other comprehensive income (loss)	143
Balance at end of period	(882)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(17,880)
Other comprehensive income before reclassifications	(43,018)
Balance at end of period	(60,898)
Tax effect of other comprehensive income gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(31,048)
Other comprehensive income before reclassifications	(908)
Balance at end of period	$ (31,956)