ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (56,967)	$ (48,090)
Change during the period
Before-tax amount	40,957	(14,323)
Tax benefit/(expense)	(15,761)	5,446
Other comprehensive loss	25,196	(8,877)	(15,600)
Balance at the end of the period	(31,771)	(56,967)	(48,090)
Pension Liability Adjustment [Member]
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	(62,502)	(52,969)
Change during the period
Before-tax amount	45,677	(15,385)
Tax benefit/(expense)	(17,575)	5,852
Other comprehensive loss	28,102	(9,533)
Balance at the end of the period	(34,400)	(62,502)
Foreign Currency Translation [Member]
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	5,535	4,879
Change during the period
Before-tax amount	(4,720)	1,062
Tax benefit/(expense)	1,814	(406)
Other comprehensive loss	(2,906)	656
Balance at the end of the period	$ 2,629	$ 5,535