Segment Information (Company's information by geographic area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 1,209,026	$ 1,096,412	$ 3,377,996	$ 3,274,413
Total, Long-lived assets	2,702,532		2,702,532		3,002,194
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,024,919	932,686	2,850,179	2,783,756
Long-lived assets	2,343,365		2,343,365		2,476,792
Other Countries Member
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	184,107	163,726	527,817	490,657
Long-lived assets	$ 359,167		$ 359,167		$ 525,402