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Supplemental Disclosure of Cash Flow Information (Tables)
12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Schedule of Supplemental Disclosure of Cash Flow Information
 
Year ended
 
December 31, 2018

December 31, 2017

December 31, 2016

 
(in thousands)
Cash paid for interest
$
13,060

$
13,094

$
13,615

Cash paid for income taxes
$
18,558

$
12,305

$
10,205