Certain Balance Sheet Components (Schedule of Accounts Payable and Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued payroll and benefits	$ 16,786	$ 18,110
Accounts payable	19,625	9,361
Accrued interest	8,427	6,385
Accrued taxes	10,387	5,103
Avery Landing accrual (see Note 16: Commitments and Contingencies)		6,000
Other current liabilities	16,627	10,242
Total accounts payable and accrued liabilities	$ 71,852	$ 55,201