ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive income activity
Balance at the beginning of the period	$ 60,683	$ 60,318	$ 123,766
Other comprehensive gain/(loss) before reclassifications	44,659	(2,813)	(65,468)
Amounts reclassified from accumulated other comprehensive income	4,409	3,178	2,020
Net current-period other comprehensive income/(loss)	49,068	365	(63,448)
Balance at the end of the period	109,751	60,683	60,318
Foreign Currency
Accumulated other comprehensive income activity
Balance at the beginning of the period	120,097	100,594	148,030
Other comprehensive gain/(loss) before reclassifications	29,868	19,503	(47,436)
Net current-period other comprehensive income/(loss)	29,868	19,503	(47,436)
Balance at the end of the period	149,965	120,097	100,594
Defined Benefit Pension Plans
Accumulated other comprehensive income activity
Balance at the beginning of the period	(59,248)	(39,908)	(23,837)
Other comprehensive gain/(loss) before reclassifications	14,791	(22,316)	(18,032)
Amounts reclassified from accumulated other comprehensive income	4,364	2,976	1,961
Net current-period other comprehensive income/(loss)	19,155	(19,340)	(16,071)
Balance at the end of the period	(40,093)	(59,248)	(39,908)
Other
Accumulated other comprehensive income activity
Balance at the beginning of the period	(166)	(368)	(427)
Amounts reclassified from accumulated other comprehensive income	45	202	59
Net current-period other comprehensive income/(loss)	45	202	59
Balance at the end of the period	$ (121)	$ (166)	$ (368)