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Note 10 - Revenue - Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Balance, beginning of period $ 152,052 $ 160,582
Deferred revenue 54,181 170,904
Recognized revenue (57,741) (182,994)
Balance, end of period $ 148,492 $ 148,492