Segment Information (Company's information by geographic area) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 470,068	$ 356,271	$ 871,004	$ 769,404
Long-lived assets	1,455,276		1,455,276		$ 1,605,365
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	402,065	261,384	735,674	564,960
Long-lived assets	1,149,913		1,149,913		1,288,077
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	68,003	$ 94,887	135,330	$ 204,444
Long-lived assets	$ 305,363		$ 305,363		$ 317,288