OTHER ACCRUED LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
OTHER ACCRUED LIABILITIES
Accrued and deferred compensation	$ 18,493	$ 16,320
Deferred tax liability	12,224	15,000
Accrued benefit and workers' compensation claims	8,140	6,906
Other	8,270	8,282
Total	47,127	46,508
Deferred compensation liability	$ 6,033	$ 4,650