Segment Information (Company's information by geographic area) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 506,029	$ 326,225	$ 1,377,033	$ 1,095,629
Long-lived assets	1,379,560		1,379,560		$ 1,605,365
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	423,137	243,586	1,158,810	808,546
Long-lived assets	1,095,568		1,095,568		1,288,077
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	82,892	$ 82,639	218,223	$ 287,083
Long-lived assets	$ 283,992		$ 283,992		$ 317,288