ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Change in accumulated other comprehensive loss
Balance at the beginning of the period			$ (341)
Other comprehensive income	11	8	21	16
Balance at the end of the period	(320)		(320)
Net tax benefit	386	718	1,339	1,348
Defined benefit pension plans
Change in accumulated other comprehensive loss
Balance at the beginning of the period			(341)
Amounts reclassified from accumulated other comprehensive loss			21
Other comprehensive income			21
Balance at the end of the period	(320)		(320)
Defined benefit pension plans | Reclassified from accumulated other comprehensive loss
Change in accumulated other comprehensive loss
Net tax benefit			$ 0