6. SEGMENT DATA

We measure segment performance based on operating income (loss). Excluding discontinued operations, our broadcast segment includes stations in 71 markets located throughout the continental United States. The operating results of WLAJ-TV and WLWC-TV, which were sold effective March 1, 2013 and April 1, 2013, respectively, are classified as discontinued operations and are not included in our consolidated results of continuing operations for the three months ended March 31, 2013. Our other operating divisions primarily consist of sign design and fabrication; regional security alarm operating and bulk acquisitions; manufacturing and service of broadcast antennas and transmitters; and real estate ventures. All of our other operating divisions are located within the United States. Corporate costs primarily include our costs to operate as a public company and to operate our corporate headquarters location. Other Operating Divisions and Corporate are not reportable segments but are included for reconciliation purposes. We had approximately $172.0 million and $171.5 million of intercompany loans between the broadcast segment, other operating divisions and corporate as of March 31, 2014 and 2013, respectively. We had $4.9 million in intercompany interest expense related to intercompany loans between the broadcast segment, other operating divisions and corporate for both the three months ending March 31, 2014 and 2013, respectively. All other intercompany transactions are immaterial.

Segment financial information is included in the following tables for the periods presented (in thousands):

For the three months ended March 31, 2014	Broadcast		Other Operating Divisions		Corporate			Consolidated
Revenue	$	397,906	$	14,742	$	—		$	412,648
Depreciation of property and equipment	23,517		594		267			24,378
Amortization of definite-lived intangible assets and other assets	23,163		1,565		—			24,728
Amortization of program contract costs and net realizable value adjustments	23,941		—		—			23,941
General and administrative overhead expenses	14,730		251		854			15,835
Operating income (loss)	82,121		1		(1,122		)	81,000
Interest expense	—		919		38,619			39,538
Income from equity and cost method investments	—		98		—			98
Assets	3,388,139		303,786		418,188			4,110,113

For the three months ended March 31, 2013	Broadcast		Other Operating Divisions			Corporate			Consolidated
Revenue	$	271,155	$	11,463		$	—		$	282,618
Depreciation of property and equipment	13,784		469			342			14,595
Amortization of definite-lived intangible assets and other assets	14,867		1,135			—			16,002
Amortization of program contract costs and net realizable value adjustments	18,861		—			—			18,861
General and administrative overhead expenses	10,129		297			824			11,250
Operating income (loss)	65,132		(309		)	(1,167		)	63,656
Interest expense	—		730			36,967			37,697
Loss from equity and cost method investments	—		(1,052		)	—			(1,052		)