Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ (784,989)	$ 75,162	$ (796,124)	$ 111,834
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		1,089		1,153
Change in cumulative translation adjustment	14,234	4,392	(445)	5,719
Comprehensive income	$ (770,755)	$ 80,643	$ (796,569)	$ 118,706