Supplemental Balance Sheet, Income Statement and Cash Flow Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense	$ 54,607	$ 46,836	$ 165,813	$ 137,803
General and administrative expenses	65,010	56,078	192,114	175,036
Other expense (income), net	5,559	10,392	29,173	267,403
Income (loss) from continuing operations before income taxes	(133,994)	(128,890)	(442,203)	(805,346)
Tax expense (benefit)	14,709	31,051	59,814	124,298
Net income (loss)	(146,419)	(110,026)	(425,466)	(695,145)
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	459	459
General and administrative expenses	50	297	150	765
Other expense (income), net		3,495	1,341	3,495
Income (loss) from continuing operations before income taxes	(203)	(3,945)	(1,950)	(4,719)
Tax expense (benefit)	78	172	235	472
Net income (loss)	$ (125)	$ (3,773)	$ (1,715)	$ (4,247)