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Note 12 - Earnings Per Share (Details) - Reconciliation of Basic and Diluted Earnings Per Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reconciliation of Basic and Diluted Earnings Per Share [Abstract]
Net income (numerator) (in Dollars)	$ 49,390us-gaap_NetIncomeLoss	$ 36,497us-gaap_NetIncomeLoss	$ 54,025us-gaap_NetIncomeLoss	$ 34,701us-gaap_NetIncomeLoss	$ 48,518us-gaap_NetIncomeLoss	$ 47,093us-gaap_NetIncomeLoss	$ 28,254us-gaap_NetIncomeLoss	$ 50,674us-gaap_NetIncomeLoss	$ 174,613us-gaap_NetIncomeLoss		$ 174,539us-gaap_NetIncomeLoss		$ 93,223us-gaap_NetIncomeLoss
Weighted average shares (denominator)
Basic									68,538,248us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		68,081,632us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		67,360,632us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock compensation awards (1)									1,632,796us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	[1]	1,585,897us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	[1]	1,832,506us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	[1]
Diluted									70,171,044us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding		69,667,529us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding		69,193,138us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share
Basic (in Dollars per share)	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.79us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.71us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.75us-gaap_EarningsPerShareBasic	$ 2.55us-gaap_EarningsPerShareBasic		$ 2.56us-gaap_EarningsPerShareBasic		$ 1.38us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ 0.70us-gaap_EarningsPerShareDiluted	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.77us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted	$ 2.49us-gaap_EarningsPerShareDiluted		$ 2.51us-gaap_EarningsPerShareDiluted		$ 1.35us-gaap_EarningsPerShareDiluted
[1] Excludes approximately 81,600, 10,300 and 363,000 stock options and restricted stock awards for the years ended December 31, 2014, 2013 and 2012, respectively, as the impact of such awards was anti-dilutive.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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