SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 4) (USD $)	0 Months Ended		3 Months Ended	9 Months Ended		1 Months Ended	0 Months Ended
	Mar. 20, 2014	Feb. 06, 2008	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Oct. 31, 2014 Subsequent Event	Sep. 30, 2014 Acquisitions	Dec. 31, 2013 Acquisitions
Restricted Cash
Restricted cash classified as noncurrent							$ 104,300,000	$ 11,400,000
Proceeds from sale of broadcast assets				83,200,000	27,992,000		83,200,000
Number of shares repurchased			1,000,000	3,900,000		900,000
Value of shares repurchased			26,100,000	108,500,000		24,200,000
Share Repurchase Program
Share repurchase program, authorized amount	150,000,000	150,000,000
Total remaining authorization amount				$ 159,000,000