Supplemental Balance Sheet, Income Statement and Cash Flow Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense	$ 56,518	$ 45,730
General and administrative expenses	63,409	62,334
Other expense (income), net	13,510	182,404
Income (loss) from continuing operations before income taxes	(173,237)	(448,708)
Tax expense (benefit)	25,609	52,064
Net income (loss)	(148,067)	(397,570)
Reclassification adjustment for (gains)/losses included in net income (loss)
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense	153	153
General and administrative expenses	50	174
Income (loss) from continuing operations before income taxes	(203)	(327)
Tax expense (benefit)	79	129
Net income (loss)	$ (124)	$ (198)