7. SEGMENT DATA

We measure segment performance based on operating income (loss). Our broadcast segment includes stations in 79 markets located throughout the continental United States. Our other operating divisions primarily consist of sign design and fabrication; regional security alarm operating and bulk acquisitions; manufacturing and service of broadcast antennas; service of broadcast 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 $207.0 million and $172.0 million of intercompany loans between the broadcast segment, other operating divisions and corporate as of March 31, 2015 and 2014, respectively. We had $5.2 million and $4.9 million in intercompany interest expense related to intercompany loans between the broadcast segment, other operating divisions and corporate for the three months ending March 31, 2015 and 2014, 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, 2015	Broadcast		Other Operating Divisions		Corporate			Consolidated
Revenue	$	485,122	$	19,653	$	—		$	504,775
Depreciation of property and equipment	24,185		725		279			25,189
Amortization of definite-lived intangible assets and other assets	37,891		2,089		—			39,980
Amortization of program contract costs and net realizable value adjustments	30,391		—		—			30,391
General and administrative overhead expenses	14,905		259		852			16,016
Operating income (loss)	87,449		744		(3,646		)	84,547
Interest expense	—		1,075		45,573			46,648
Income from equity and cost method investments	—		3,146		—			3,146
Assets	4,865,380		366,307		185,792			5,417,479

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