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Note 1 - Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and cash equivalents $ 239,411 $ 249,417 $ 632,808 $ 203,104
Restricted cash 23,666 23,785 26,112 24,175
Total cash, cash equivalents and restricted cash $ 263,077 $ 273,202 $ 658,920 $ 227,279