Supplemental Balance Sheet, Income Statement and Cash Flow Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Investment income (loss)	$ 310	$ (22)	$ 923	$ 2,128
Interest expense	46,836	44,448	137,803	135,518
General and administrative expenses	56,078	72,032	175,036	263,272
Other expense (income), net	10,392	259,731	267,403	205,227
Income (loss) from continuing operations before income taxes	(128,890)	(331,777)	(805,346)	(203,565)
Income tax expense (benefit)	(31,051)	(80,898)	(124,298)	(35,158)
Net income (loss)	(110,026)	(296,154)	(695,145)	(209,474)
Accumulated Other Comprehensive Income | 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	297	276	765	828
Other expense (income), net	3,495		3,495	5,365
Income (loss) from continuing operations before income taxes	(3,945)	(429)	(4,719)	(6,652)
Income tax expense (benefit)	172	162	472	485
Net income (loss)	$ (3,773)	$ (267)	$ (4,247)	$ (6,167)