Supplemental Balance Sheet, Income Statement and Cash Flow Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Investment income (loss)	$ 270	$ 1,181	$ 613	$ 2,150
Interest expense	45,237	44,469	90,967	91,070
General and administrative expenses	56,624	75,810	118,958	191,240
Other expense (income), net	74,607	1,338	257,011	(54,504)
Income (loss) from continuing operations before income taxes	(227,748)	24,555	(676,456)	128,212
Income tax expense (benefit)	(41,183)	66,445	(93,247)	45,740
Net income (loss)	(187,549)	(36,865)	(585,119)	86,680
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	306	306
General and administrative expenses	294	276	468	552
Other expense (income), net				5,365
Income (loss) from continuing operations before income taxes	(447)	(429)	(774)	(6,223)
Income tax expense (benefit)	171	161	300	323
Net income (loss)	$ (276)	$ (268)	$ (474)	$ (5,900)