SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Income by component (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (179,072)
Other comprehensive income before reclassifications	2,605
Amounts reclassified from accumulated other comprehensive income (loss)	1,430
Balance at end of period	(175,037)
Defined benefit plans adjustment | Pension
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(26,123)
Other comprehensive income before reclassifications	136
Amounts reclassified from accumulated other comprehensive income (loss)	594
Balance at end of period	(25,393)
Defined benefit plans adjustment | Postretirement Medical Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(51,893)
Amounts reclassified from accumulated other comprehensive income (loss)	964
Balance at end of period	(50,929)
Available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1,674)
Other comprehensive income before reclassifications	938
Amounts reclassified from accumulated other comprehensive income (loss)	(128)
Balance at end of period	(864)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(61,073)
Other comprehensive income before reclassifications	2,103
Balance at end of period	(58,970)
Tax effect of other comprehensive income gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(38,309)
Other comprehensive income before reclassifications	(572)
Balance at end of period	$ (38,881)