Depreciation and Amortization (Tables)

9 Months Ended

Sep. 30, 2018

Depreciation And Amortization [Abstract]

Depreciation and Amortization Expense Excluded from Operating Expenses in its Statements of Income and Comprehensive Income

The amounts of depreciation and amortization expense excluded from the following operating expenses in its Statements of Income and Comprehensive Income are: 

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Direct advertising expenses	$	51,360	$	47,168	$	155,832	$	144,171
General and administrative expenses		927		955		2,935		2,857
Corporate expenses		2,802		3,673		8,484		7,975
	$	55,089	$	51,796	$	167,251	$	155,003