Details Of Certain Accounts - Other Current Assets (Details) - USD ($) $ in Thousands	1 Months Ended
	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Note receivable		$ 0	$ 10,000
Prepaids		10,102	13,973
Deferred costs		27,204	7,971
Other		4,462	5,444
Total other current assets		$ 41,768	$ 37,388
Noncurrent note receivable, interest rate (as a percent)			6.00%
Proceeds from collection of note receivable	$ 10,000