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Other Current Assets - Schedule of Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Income tax receivable $ 12,609 $ 10,886
Prepaid vendor payments 4,910 4,492
Prepaid software maintenance 4,732 4,010
Prepaid insurance 2,609 2,754
Prepaid taxes 696 591
Prepaid other 6,181 1,755
Other 1,008 998
Other current assets $ 32,745 $ 25,486