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Note 9 - Earnings Per Share (Details) - Reconciliation of Basic and Diluted Earnings Per Share (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of Basic and Diluted Earnings Per Share [Abstract]    
Net income (numerator) (in Dollars) $ 19,685us-gaap_NetIncomeLoss $ 34,701us-gaap_NetIncomeLoss
Weighted average shares (denominator)    
Basic 68,806,337us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 68,421,800us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock compensation awards (1) 1,282,598us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1] 1,586,690us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [1]
Diluted 70,088,935us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 70,008,490us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share    
Basic (in Dollars per share) $ 0.29us-gaap_EarningsPerShareBasic $ 0.51us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share) $ 0.28us-gaap_EarningsPerShareDiluted $ 0.50us-gaap_EarningsPerShareDiluted
[1] Excludes approximately 89,100 stock options and 200 shares of restricted stock for the three month period ended March 31, 2015, as the impact of such awards was anti-dilutive. Excludes approximately 22,000 stock options and 400 shares of restricted stock for the three month periods ended March 31, 2014, as the impact of such awards was anti-dilutive.