COMMITMENTS AND CONTINGENCIES: (Details 2) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended	1 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended			1 Months Ended		1 Months Ended
	Oct. 02, 2012 item	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010	Jan. 02, 2012 Four Points item	Dec. 31, 2008 LMA item	Dec. 31, 2012 LMA item	Jun. 30, 2012 Network affiliation agreements FOX	Dec. 31, 2012 Network affiliation agreements FOX	Apr. 30, 2013 Network affiliation agreements FOX	May 14, 2012 Network affiliation agreements FOX item	May 31, 2012 Option agreement FOX item	May 14, 2012 Option agreement FOX WUTB (MNT) station in Baltimore	May 31, 2012 Option agreement FTS Maximum item
COMMITMENTS AND CONTINGENCIES
Number of affiliates											20
Purchase price pursuant to option													$ 2,700,000
Option to purchase stations, number of markets														3
Number of markets	3	47			4							4
Amount paid pursuant to the agreements								25,000,000
Other assets		189,984,000	123,409,000					50,000,000
Other accrued liabilities		78,013,000	37,498,000					25,000,000	25,000,000	25,000,000
Amortization of definite-lived intangible assets and other assets		$ 38,099,000	$ 18,229,000	$ 18,834,000					$ 5,600,000
Number of separately owned television stations having programming agreement							2
Number of stations that programs substantial portions of the broadcast day and sells advertising time to programming segments							1
Number of license applications withdrawn						5