Note 16 - Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Stockholders' Equity Attributable to Parent	$ 1,734,673		$ 1,747,778
Stockholders' Equity, Period Increase (Decrease)	13,100
Treasury Stock, Value, Acquired, Cost Method	54,400
Dividends, Common Stock, Cash	14,200
Net Income (Loss) Attributable to Parent	46,163	$ 35,980
Other Comprehensive Income (Loss), Net of Tax	$ 7,353	$ 4,923