SIGNIFICANT ACCOUNTING POLICIES Additional Information (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Trade Accounts Receivable
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts	$ 12,400,000	$ 14,700,000
Noncurrent Assets Member
Significant Accounting Policies [Line Items]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	10,700,000	12,700,000
Corporate Bond Securities
Significant Accounting Policies [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 67,173,000	$ 70,019,000