CONDENSED CONSOLIDATING FINANCIAL STATEMENTS: (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	$ 49,702	$ 67,483
CASH FLOWS (USED IN) FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(7,482)	(6,736)
Proceeds from sale of broadcast assets	14,312
Payments for acquisitions of television stations		(205,622)
Purchase of alarm monitoring contracts	(1,924)	(3,035)
(Increase) decrease in restricted cash	(24,945)	20,000
Investment in marketable securities	(1,195)
Distributions from investments	2,228
Investments in equity and cost method investees	(1,758)	(5,503)
Proceeds from the sale of real estate investment	5,516
Loans to affiliates	(42)	(500)
Proceeds from loans to affiliates	13	417
Other investing activities	335	19
Net cash flows used in investing activities	(14,942)	(200,960)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable, commercial bank financing and capital leases	101,128	184,482
Repayments of notes payable, commercial bank financing and capital leases	(112,623)	(23,529)
Proceeds from share based awards	1,242	279
Dividends paid on Class A and Class B Common Stock	(12,048)	(9,588)
Payments for deferred financing costs	(801)	(3,519)
Proceeds from Class A Common Stock sold by variable interest entity	1,045
Distributions to noncontrolling interests	(9,329)	(88)
Repayments of notes and capital leases to affiliates	(414)	(725)
Net cash flows (used in) from financing activities	(31,800)	147,312
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,960	13,835
CASH AND CASH EQUIVALENTS, beginning of period	22,865	12,967
CASH AND CASH EQUIVALENTS, end of period	25,825	26,802
Sinclair Broadcast Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	3,002	256
CASH FLOWS (USED IN) FROM INVESTING ACTIVITIES:
Loans to affiliates	(42)	(44)
Proceeds from loans to affiliates	13	64
Net cash flows used in investing activities	(29)	20
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Repayments of notes payable, commercial bank financing and capital leases	(115)	(100)
Proceeds from share based awards	1,242	279
Dividends paid on Class A and Class B Common Stock	(12,195)	(9,718)
Repayments of notes and capital leases to affiliates	(276)	(242)
Increase (decrease) in intercompany payables	8,371	9,505
Net cash flows (used in) from financing activities	(2,973)	(276)
Sinclair Television Group, Inc.
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	(8,428)	(22,191)
CASH FLOWS (USED IN) FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(181)	(1,741)
(Increase) decrease in restricted cash	(24,945)	20,000
Loans to affiliates		(456)
Proceeds from loans to affiliates		353
Net cash flows used in investing activities	(25,126)	18,156
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable, commercial bank financing and capital leases	93,500	178,200
Repayments of notes payable, commercial bank financing and capital leases	(110,092)	(16,252)
Payments for deferred financing costs	(778)	(3,519)
Increase (decrease) in intercompany payables	50,193	(137,271)
Net cash flows (used in) from financing activities	32,823	21,158
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(731)	17,123
CASH AND CASH EQUIVALENTS, beginning of period	7,230	188
CASH AND CASH EQUIVALENTS, end of period	6,499	17,311
Guarantor Subsidiaries and KDSM, LLC
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	56,623	85,987
CASH FLOWS (USED IN) FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(6,725)	(4,675)
Proceeds from sale of broadcast assets	14,312
Payments for acquisitions of television stations		(205,622)
Other investing activities	335	19
Net cash flows used in investing activities	7,922	(210,278)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Repayments of notes payable, commercial bank financing and capital leases	(181)	(128)
Repayments of notes and capital leases to affiliates	(138)	(483)
Increase (decrease) in intercompany payables	(63,769)	125,569
Net cash flows (used in) from financing activities	(64,088)	124,958
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	457	667
CASH AND CASH EQUIVALENTS, beginning of period	199	313
CASH AND CASH EQUIVALENTS, end of period	656	980
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	(4,012)	1,682
CASH FLOWS (USED IN) FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(576)	(320)
Purchase of alarm monitoring contracts	(1,924)	(3,035)
Investment in marketable securities	(1,195)
Distributions from investments	2,228
Investments in equity and cost method investees	(1,758)	(5,503)
Proceeds from the sale of real estate investment	5,516
Net cash flows used in investing activities	2,291	(8,858)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Proceeds from notes payable, commercial bank financing and capital leases	7,628	6,282
Repayments of notes payable, commercial bank financing and capital leases	(2,235)	(7,049)
Payments for deferred financing costs	(23)
Proceeds from Class A Common Stock sold by variable interest entity	1,045
Distributions to noncontrolling interests	(9,329)	(88)
Increase (decrease) in intercompany payables	7,869	4,076
Net cash flows (used in) from financing activities	4,955	3,221
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3,234	(3,955)
CASH AND CASH EQUIVALENTS, beginning of period	15,436	12,466
CASH AND CASH EQUIVALENTS, end of period	18,670	8,511
Eliminations
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
NET CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES	2,517	1,749
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Dividends paid on Class A and Class B Common Stock	147	130
Increase (decrease) in intercompany payables	(2,664)	(1,879)
Net cash flows (used in) from financing activities	$ (2,517)	$ (1,749)