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Note 9 - Stockholders' Equity and Stock Incentive Plans - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Shares repurchased and retired (in shares) [1],[2] 245   301   1,075 860
Total cost, including brokerage fees $ 6,108 [2] $ 21,653 $ 10,529 [2] $ 19,803 $ 27,760 [2] $ 30,332 [2]
Average repurchase price per share (3) (in dollars per share) [2],[3] $ 24.90   $ 35.02   $ 25.82 $ 35.28
[1] All shares repurchased have been retired and constitute authorized but unissued shares.
[2] Shares repurchased reflect repurchases settled during the three and six months ended June 30, 2019 and 2018. These amounts exclude repurchases traded but not yet settled on or before June 30, 2019 and 2018.
[3] Amounts in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers.