COMMITMENTS AND CONTINGENCIES: (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		1 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Network affiliation agreements FOX	Jun. 30, 2012 Network affiliation agreements FOX	Jun. 30, 2013 Network affiliation agreements FOX	May 14, 2012 Network affiliation agreements FOX item	May 31, 2012 Option agreement FTS item	May 14, 2012 Option agreement FTS WUTB (MNT) station in Baltimore	May 31, 2012 Option agreement FTS Maximum item	Feb. 28, 2013 Pending acquisition agreement Barrington Broadcasting Group, LLC item	Apr. 30, 2013 Pending acquisition agreement Fisher item	Jun. 30, 2013 Pending acquisition agreement TTBG item	Jul. 31, 2013 Pending acquisition agreement Perpetual Corporation and Charleston Television, LLC	Jun. 30, 2013 Pending acquisition agreement Deerfield TTBG 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 designated markets										4
Number of markets													15	8	3
Amount paid pursuant to the agreements						25,000,000	25,000,000
Other assets	188,705,000		188,705,000		189,984,000		50,000,000
Other accrued liabilities							25,000,000
Amortization of definite-lived intangible assets and other assets	15,557,000	9,994,000	31,559,000	15,813,000		2,200,000	1,100,000	4,400,000
Price of assets acquired/sold													370,000,000
Number of television stations owned													18		4
Number of stations to which sales services were provided													6	3
Number of stations located in specified markets													24	20
Value of merger transaction														$ 373,300,000	$ 115,400,000	$ 985,000,000
Number of radio stations in Seattle market														4
Number of simulcasts to which sales services were provided														2
Number of stations to which purchasing rights will be assigned																	2
Number of stations to which sales and other services will be provided																	2