DEBT (Details 1) (USD $)	3 Months Ended		1 Months Ended			1 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Oct. 31, 2011 Revolving Credit Facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Oct. 31, 2011 Revolving Credit Facility [Member] Minimum [Member]	Oct. 31, 2011 Revolving Credit Facility [Member] Maximum [Member]	Oct. 31, 2011 Revolving Credit Facility [Member] Rate 1 [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member]	Oct. 31, 2011 Revolving Credit Facility [Member] Rate 1 [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member]	Oct. 31, 2011 Revolving Credit Facility [Member] Rate 2B [Member] Federal funds rate [Member]	Oct. 31, 2011 Revolving Credit Facility [Member] Rate 2C [Member] Minimum [Member]	Oct. 31, 2011 Revolving Credit Facility [Member] Rate 2C [Member] Maximum [Member]	Oct. 31, 2011 Revolving Credit Facility [Member] Rate 2C [Member] One month LIBOR [Member]	Oct. 31, 2011 Swingline Loans [Member]	Oct. 31, 2011 Letter of Credit [Member]
Debt Instrument
Revolving credit facility, maximum borrowing capacity			$ 1,000,000,000.0											$ 50,000,000.0	$ 100,000,000.0
Period of revolving credit facility (in years)			5 years
Basis spread on variable rate								1.00%	1.50%	0.50%	0.00%	0.50%	1.00%
Commitment fee rate						0.10%	0.25%
Revolving credit facility, amount outstanding				0	0
Letters of credit issued	$ 2,200,000	$ 2,200,000
Line of credit, interest rate description	Borrowings under the revolving credit facility will bear interest, at the Company's option, at a rate per annum equal to either (i) the adjusted LIBOR for the interest period in effect for such borrowing plus an applicable margin ranging from 1.00% to 1.50%; or (ii) the greatest of (a) JPMorgan Chase Bank, National Association's prime lending rate, (b) the federal funds rate plus 0.50%, and (c) an adjusted LIBOR for an interest period of one month plus 1.00%, plus an applicable margin ranging from 0.00% to 0.50%