Accumulated Other Comprehensive Income Details 2 (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Net Income (Loss) Attributable to Parent	$ 92,466	$ 65,674	$ 384,370
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	23,878	6,832	$ (88,349)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 116,344	$ 72,506