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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental cash flow information
 
 
Years Ended December 31,
 
 
 
2018
 
 
2017
 
 
2016
 
 
 
(In thousands)
 
 
 
 
 
 
 
 
 
 
 
Cash paid during the period for:
 
 
 
 
 
 
 
 
 
 
 
 
Interest
 
$
884
 
 
$
850
 
 
$
636
 
Income taxes
 
$
2,864
 
 
$
2,420
 
 
$
6,555
 
Non-cash transactions:
 
 
 
 
 
 
 
 
 
 
 
 
Barter revenue
 
$
3,570
 
 
$
3,618
 
 
$
3,471
 
Barter expense
 
$
3,677
 
 
$
3,367
 
 
$
3,217
 
Purchase of treasury shares in connection with exercise of stock options
 
$
—
 
 
$
826
 
 
$
—
 
Acquisition of property and equipment
 
$
11
 
 
$
8
 
 
$
49
 
Use of treasury shares for 401(k) match
 
$
252
 
 
$
274
 
 
$
258