FAIR VALUE (Details) (USD $)	3 Months Ended		12 Months Ended																																									3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Cash [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Cash [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Money Market Funds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Money Market Funds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Commercial Paper [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Commercial Paper [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Auction Rate Securities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Auction Rate Securities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Cash [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Cash [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Money Market Funds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Money Market Funds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Commercial Paper [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Commercial Paper [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Auction Rate Securities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Auction Rate Securities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Cash [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Cash [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Money Market Funds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Money Market Funds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Commercial Paper [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Commercial Paper [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Auction Rate Securities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Auction Rate Securities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Cash [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Cash [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Money Market Funds [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Money Market Funds [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Commercial Paper [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Commercial Paper [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Auction Rate Securities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Auction Rate Securities [Member]	Mar. 31, 2014 Auction Rate Securities [Member]	Dec. 31, 2013 Auction Rate Securities [Member]	Dec. 31, 2012 Auction Rate Securities [Member]	Dec. 31, 2011 Auction Rate Securities [Member]	Dec. 31, 2010 Auction Rate Securities [Member]	Dec. 31, 2009 Auction Rate Securities [Member]	Dec. 31, 2008 Auction Rate Securities [Member]	Mar. 31, 2014 LandsofAmerica [Member]	Dec. 31, 2013 LandsofAmerica [Member]	Mar. 28, 2013 LandsofAmerica [Member]	Mar. 31, 2014 Reaction Web [Member]	Dec. 31, 2013 Reaction Web [Member]	Mar. 28, 2013 Reaction Web [Member]
Assets:
Total assets measured at fair value				$ 245,611,000	$ 277,943,000	$ 20,358,000	$ 134,989,000	$ 263,000	$ 50,593,000	$ 202,822,000	$ 70,371,000	$ 22,168,000	$ 21,990,000	$ 223,443,000	$ 255,953,000	$ 20,358,000	$ 134,989,000	$ 263,000	$ 50,593,000	$ 202,822,000	$ 70,371,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 22,168,000	$ 21,990,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 22,168,000	$ 21,990,000
Unobservable inputs assets (level 3) [Roll forward]
Beginning balance	21,990,000	21,662,000	21,662,000																																									21,990,000	21,662,000	24,584,000	29,189,000	29,724,000	29,340,000	53,975,000
Change in unrealized gain (loss) included in accumulated other comprehensive loss	178,000	63,000																																										178,000	378,000	836,000	245,000	40,000	684,000	(3,710,000)
Settlements	0	(50,000)																																										0	(50,000)	(4,200,000)	(4,850,000)	(575,000)	(300,000)	(20,925,000)
Auction rate securities upon acquisition																																														442,000
Ending balance	22,168,000	21,675,000	21,990,000																																									22,168,000	21,990,000	21,662,000	24,584,000	29,189,000	29,724,000	29,340,000
Auction rate securities variable rate debt instruments interest rate reset period	28 days
The minimum contractual maturities on underlying securities involved in auction rate securities	20 years
Par value of company held auction rate securities	24,300,000
Discount rate (in percent)	4.90%		4.90%
Temporary impairment of the auction rates security investments	(1,349,000)		(1,527,000)
Liabilities:
Deferred consideration					1,344,000										0										0									0	1,344,000
Unobservable inputs liabilities (level 3) [Roll forward]
Beginning balance	1,344,000	2,304,000	2,304,000
Accretion	0	126,000	384,000
Payments	(1,344,000)	(1,344,000)	(1,344,000)
Ending balance	0	1,086,000	1,344,000
Business acquisition deferred consideration potential cash payment (undiscounted)																																																				1,000,000			344,000
Business acquisition deferred consideration cash payment																																																			$ 1,000,000		$ 1,000,000	$ 344,000		$ 344,000