CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
NET INCOME (LOSS)	$ 107,936		$ 87,296		$ (265,400)
OTHER COMPREHENSIVE (LOSS) INCOME :
Change in pension benefit plans assets/liabilities	(13,887)	[1]	18,675	[1]	(1,697)	[1]
Foreign currency translation	(1,086)		(1,212)		608
Change in fair value of investments	345		(744)		396
Change in fair value of interest rate swap	594		948		(1,659)
Realized loss on sale of investments recorded in net income (loss)					3,224
Other comprehensive (loss) income before taxes	(14,034)		17,667		872
INCOME TAX EXPENSE (BENEFIT):
Tax adjustment on minimum pension liability	(5,732)		7,765		(87)
Foreign currency translation	(448)		(474)		226
Change in fair value of investments	141		(189)		158
Change in fair value of interest rate swap	245		370		(685)
Realized loss on sale of investments recorded in net income (loss)					1,219
Income tax expense	(5,794)		7,472		831
NET OTHER COMPREHENSIVE (LOSS) INCOME	(8,240)		10,195		41
TOTAL COMPREHENSIVE INCOME (LOSS)	$ 99,696		$ 97,491		$ (265,359)

[1] See discussion under Defined Benefit Pension Plan in Note 7 — Employee Benefit Plans.