ORGANIZATION (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009 item
ORGANIZATION
Number of reportable operating segments prior to expansion	1
Number of reportable business segments	2
Business Combinations: Contingent Consideration
Aggregate purchase price in cash			$ 0.8	$ 5.7
Period of estimated cumulative earnings as basis for contingent consideration			36 months	36 months
Reduction in contingent consideration		0.3
Contingent consideration				1.0
Number of entities acquired				4
Minimum
Business Combinations: Contingent Consideration
Payout of contingent consideration			$ 0	$ 0