Segment Information (Company's information by geographic area) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 413,133	$ 917,235
Long-lived assets	2,065,528		$ 2,123,291
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	303,576	760,443
Long-lived assets	1,726,577		1,799,418
Other Countries Member
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	109,557	$ 156,792
Long-lived assets	$ 338,951		$ 323,873