Debt and Other Long Term Liabilities (Details) - USD ($) $ in Thousands	Feb. 29, 2016	Dec. 31, 2015	Dec. 31, 2014
Long Term Liabilities [Abstract]
Bank indebtedness		$ 0	$ 518,000
Senior notes		0	2,760,000
Other long-term obligations		165,784	152,472
Total Debt And Long Term Liabilities		3,555,784	3,530,472
Short-term Debt [Abstract]
Senior Notes		2,760,000	100,000
Bank indebtedness current	$ 999,000	$ 630,000	$ 0