Accumulated Other Comprehensive Income Details 2 (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Net Income (Loss) Attributable to Parent	$ 65,674	$ 63,051	$ 352,820
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	6,832	(6,256)	$ (53,700)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 72,506	$ 56,795