FAIR VALUE MEASUREMENT - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Inputs, Level 1
Assets measured at fair value:
Other assets - Equity instruments	$ 0	$ 44
Total assets measured at fair value	4,005	3,048
Liabilities measured at fair value:
Other liabilities - Deferred compensation	0	44
Total liabilities measured at fair value	0	44
Fair Value, Inputs, Level 1 | Money Market Funds
Assets measured at fair value:
Cash and cash equivalents	4,005	3,004
Fair Value Disclosure, Total
Assets measured at fair value:
Other assets - Equity instruments	0	44
Total assets measured at fair value	4,005	3,048
Liabilities measured at fair value:
Other liabilities - Deferred compensation	0	44
Total liabilities measured at fair value	0	44
Fair Value Disclosure, Total | Money Market Funds
Assets measured at fair value:
Cash and cash equivalents	$ 4,005	$ 3,004