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FAIR VALUE MEASUREMENT Changes in Fair Value of Recurring Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Dec. 31, 2017	Apr. 02, 2017	Jan. 01, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash, cash equivalents and restricted cash	$ 79,054	$ 73,831	$ 80,439	$ 103,222
Deferred compensation mutual funds	24,093	22,428
Held-to-maturity Securities, Fair Value	164,446	172,238
Total Fair Value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents	26,636	28,780
Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents	26,636	28,780
Restricted Assets | Total Fair Value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Restricted cash and cash equivalents	52,418	45,051
Cash, cash equivalents and restricted cash	79,054	73,831
Deferred compensation mutual funds	24,093	22,428
Held-to-maturity Securities, Fair Value	164,446	172,238
Restricted Assets | Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Restricted cash and cash equivalents	0	0
Cash, cash equivalents and restricted cash	0	0
Deferred compensation mutual funds	0	0
Held-to-maturity Securities, Fair Value	0	0
Restricted Assets | Significant Other Observable Inputs (Level 2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Restricted cash and cash equivalents	0	0
Cash, cash equivalents and restricted cash	0	0
Deferred compensation mutual funds	0	0
Held-to-maturity Securities, Fair Value	164,446	172,238
Restricted Assets | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Restricted cash and cash equivalents	52,418	45,051
Cash, cash equivalents and restricted cash	79,054	73,831
Deferred compensation mutual funds	24,093	22,428
Held-to-maturity Securities, Fair Value	0	0
Municipal debt securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	78,643	83,366
Municipal debt securities | Restricted Assets | Total Fair Value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	78,643	83,366
Municipal debt securities | Restricted Assets | Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Municipal debt securities | Restricted Assets | Significant Other Observable Inputs (Level 2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	78,643	83,366
Municipal debt securities | Restricted Assets | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Corporate debt securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	81,182	83,791
Corporate debt securities | Restricted Assets | Total Fair Value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	81,182	83,791
Corporate debt securities | Restricted Assets | Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Corporate debt securities | Restricted Assets | Significant Other Observable Inputs (Level 2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	81,182	83,791
Corporate debt securities | Restricted Assets | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Agency mortgage-backed securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	3,630	4,062
Agency mortgage-backed securities | Restricted Assets | Total Fair Value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	3,630	4,062
Agency mortgage-backed securities | Restricted Assets | Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	0	0
Agency mortgage-backed securities | Restricted Assets | Significant Other Observable Inputs (Level 2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	3,630	4,062
Agency mortgage-backed securities | Restricted Assets | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	0	0
U.S. government and agency securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	991	1,019
U.S. government and agency securities | Restricted Assets | Total Fair Value
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	991	1,019
U.S. government and agency securities | Restricted Assets | Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	0	0
U.S. government and agency securities | Restricted Assets | Significant Other Observable Inputs (Level 2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	991	1,019
U.S. government and agency securities | Restricted Assets | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Held-to-maturity Securities, Fair Value	$ 0	$ 0

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