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Cash and Cash Equivalents (Tables)
12 Months Ended
Dec. 31, 2018
Cash and cash equivalents [abstract]  
Disclosure of detailed information about cash and cash equivalents [Text Block]
 
 
January 1,
2017
 
 
December 31,
2017
    
 
 
December 31,
2018 
     
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
Cash, demand deposits and checking accounts
 
$
171,397
 
 
 
115,464
 
 
 
98,400
 
Time deposits with less than three months maturity date
 
 
13,055
 
 
 
22,559
 
 
 
8,037
 
 
 
$
184,452
 
 
 
138,023
 
 
 
106,437