LONG-TERM DEBT: (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Total Debt	$ 822,370,000	$ 824,078,000
Senior Secured Leverage	4.07
Total Leverage	7.84
Interest Coverage	1.26
Credit Agreement 2011 [Member]
Pro Forma Last Twelve Months Covenant EBITDA	86,600,000
Pro Forma Last Twelve Months Interest Expense	68,700,000
Senior Debt	352,400,000
Total Debt	$ 679,400,000
Senior Secured Debt [Member] | Covenant Limit [Member] | Credit Agreement 2011 [Member]
Senior Secured Leverage	4.50
Total Leverage	8.50
Interest Coverage	1.10
Senior Secured Debt [Member] | Excess Coverage [Member] | Credit Agreement 2011 [Member]
Senior Secured Leverage	0.43
Total Leverage	0.66
Interest Coverage	0.16