Supplemental Balance Sheet, Income Statement and Cash Flow Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense	$ 54,688	$ 45,237	$ 111,206	$ 90,967
General and administrative expenses	63,695	56,624	127,104	118,958
Other expense (income), net	10,104	74,607	23,614	257,011
Income (loss) from continuing operations before income taxes	(134,972)	(227,748)	(308,209)	(676,456)
Tax expense (benefit)	19,496	41,183	45,105	93,247
Net income (loss)	(130,980)	(187,549)	(279,047)	(585,119)
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	306	306
General and administrative expenses	50	294	100	468
Other expense (income), net	1,341		1,341
Income (loss) from continuing operations before income taxes	(1,544)	(447)	(1,747)	(774)
Tax expense (benefit)	78	171	157	300
Net income (loss)	$ (1,466)	$ (276)	$ (1,590)	$ (474)