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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Details of Supplemental Cash Flow Information The following table provides information regarding supplemental cash flows for the years ended December 31 (in thousands):
 
2018
 
2017
 
2016
Cash paid during the year for:
 
 
 
 
 
Income taxes
$
13,442

 
$
24,330

 
$
21,324

Interest, net
$
3,814

 
$
3,518

 
$
2,101

Non-Cash Financing and Investing Transactions:
 
 
 
 
 
Unsettled repurchases of common stock
$
556

 
$
898

 
$
935

Employee stock purchase plan
$
549

 
$
522

 
$
669

Equipment acquired under capital leases
$
—

 
$
937

 
$
1,153

Receivable for sale of Global's assets
$
—

 
$
1,979

 
$
—

Shares tendered in payment of exercise price of stock options
$
—

 
$
—

 
$
63