ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Change in accumulated other comprehensive loss
Balance at the beginning of the period	$ (127)
Other comprehensive income	8	10
Balance at the end of the period	(119)
Net tax benefit	1,017	953
Defined benefit pension plans
Change in accumulated other comprehensive loss
Balance at the beginning of the period	(127)
Amounts reclassified from accumulated other comprehensive loss	8
Other comprehensive income	8
Balance at the end of the period	(119)
Defined benefit pension plans | Reclassified from accumulated other comprehensive loss
Change in accumulated other comprehensive loss
Net tax benefit	$ 0