Segment Information (Company's information by geographic area) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 710,784	$ 1,107,552	$ 1,628,019	$ 2,168,970
Total, Long-lived assets	2,461,629		2,461,629		$ 2,733,839
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	541,337	932,941	1,301,780	1,825,260
Long-lived assets	2,114,080		2,114,080		2,416,306
Other Countries Member
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	169,447	$ 174,611	326,239	$ 343,710
Long-lived assets	$ 347,549		$ 347,549		$ 317,533