BORROWINGS UNDER LINES OF CREDIT (Details) (U.S. Bank and East-West Bank [Member], Revolving Credit Facility [Member], Unsecured Debt [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]
Increase in maximum borrowing capacity	$ 40.0
Maximum borrowing capacity	140.0
Rent adjusted fixed charge coverage ratio		2.52
Balance sheet leverage ratio		0.61
Debt instrument, Covenant, Tangible Net Worth		730.3
Minimum requirement of unrestricted cash cash equivalents and publicly traded marketable securities		178.2
Average outstanding amount		14.9	11.2
Minimum [Member]
Line of Credit Facility [Line Items]
Rent adjusted fixed charge coverage ratio		1.50
Debt instrument, Covenant, Tangible Net Worth		250.0
Minimum requirement of unrestricted cash cash equivalents and publicly traded marketable securities		$ 40.0
Maximum [Member]
Line of Credit Facility [Line Items]
Balance sheet leverage ratio		1.50
LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.75%