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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Current assets:    
Cash and cash equivalents $ 301,167 $ 182,411
Restricted cash (included in other current assets) 1,140 1,444
Total cash, cash equivalents and restricted cash $ 302,307 $ 183,855