COMMITMENTS AND CONTINGENCIES Operating Leases, Rent Expense, Minimum Rentals (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Line Items]
2013	$ 24,024
2014	18,837
2015	15,571
2016	13,926
2017	10,528
Thereafter	21,840
Total future minimum payments due	104,726
Office and general
Commitments And Contingencies [Line Items]
Operating leases, rent expense	$ 19,669	$ 20,193	$ 19,285