COMMITMENTS AND CONTINGENCIES Operating Leases, Rent Expense, Minimum Rentals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies [Line Items]
Operating Leases, Rent Expense, Sublease Rentals	$ 6,426
2017	15,282
2018	10,124
2019	6,267
2020	1,892
2021	322
Thereafter	971
Total future minimum payments due	34,858
Office and general
Commitments And Contingencies [Line Items]
Operating leases, rent expense	$ 8,531	$ 8,931	$ 10,540
Property Subject to Operating Lease [Member]
Commitments And Contingencies [Line Items]
Lease Expiration Date	Dec. 31, 2027
Property Subject to Sublease [Member]
Commitments And Contingencies [Line Items]
Lease Expiration Date	Dec. 31, 2027