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Supplemental Disclosure of Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]      
Cash paid for interest $ 13,060 $ 13,094 $ 13,615
Cash paid for income taxes $ 18,558 $ 12,305 $ 10,205