Note 8 - Earnings Per Share (Details) - Reconciliation of Basic and Diluted Earnings Per Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reconciliation of Basic and Diluted Earnings Per Share [Abstract]
Numerator- net income (in Dollars)	$ 54,025		$ 28,254		$ 88,726		$ 78,928
Denominator- weighted average shares
Basic	68,538,251		68,140,330		68,481,682		68,003,164
Dilutive effect of stock compensation awards (1)	1,549,725	[1]	1,669,269	[1]	1,606,756	[1]	1,798,334	[1]
Diluted	70,087,976		69,809,599		70,088,438		69,801,498
Net income per share
Basic (in Dollars per share)	$ 0.79		$ 0.41		$ 1.30		$ 1.16
Diluted (in Dollars per share)	$ 0.77		$ 0.40		$ 1.27		$ 1.13

[1] Excludes approximately 64,800 and 70,400 stock options for the three and six month periods ended June 30, 2014, respectively, as the impact of such awards was anti-dilutive. Excludes approximately 300,000 and 250,000 stock options for the three and six month periods ended June 30, 2013, respectively, as the impact of such awards was anti-dilutive.