SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Term Loan	Dec. 31, 2012 Term Loan	Mar. 31, 2013 Prior Term Loan Facility	Jun. 30, 2013 7.125% Senior Notes due 2018	Dec. 31, 2012 7.125% Senior Notes due 2018	Jun. 30, 2013 Seller Notes	Dec. 31, 2012 Seller Notes	Jun. 30, 2013 Revolving Credit Facility	Dec. 31, 2012 Revolving Credit Facility	Mar. 31, 2013 Prior Revolving Credit Facility	Jun. 30, 2013 Recurring basis Money Market Funds	Dec. 31, 2012 Recurring basis Money Market Funds
Fair Value of Financial Instruments
Fair value of assets													$ 2,500,000	$ 11,000,000
Fair value of assets													$ 1.00
Fair value of Senior Notes						214,000,000	211,500,000
Carrying value	504,474,000	520,646,000	225,000,000	293,300,000		200,000,000	200,000,000	24,474,000	27,346,000	55,000,000	0
Maximum borrowing capacity			$ 225,000,000		$ 300,000,000					$ 200,000,000		$ 100,000,000
Revenue Recognition
Customer contract term, minimum	1 year
Customer contract term, maximum	5 years
Minimum period of receivable balances for which an evaluation of its collectability is performed at least semi-annually	180 days