Note 16 - Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,669,065		$ 1,669,065		$ 1,602,888
Increase (Decrease) in Total Equity			$ 66,200
Percentage Change in Total Equity			4.10%
Net Income (Loss) Attributable to Parent	45,200	$ 35,084	$ 81,180	$ 66,343
Other Comprehensive Income (Loss), Net of Tax	$ (2,136)	$ 13,194	2,787	$ 20,833
Dividends, Common Stock, Cash			$ 19,200