Certain Balance Sheet Components (Schedule of Accounts Payable and Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued payroll and benefits	$ 19,980	$ 18,110
Accounts payable	18,114	9,361
Accrued interest	10,078	6,385
Accrued taxes	9,868	5,103
Avery Landing accrual (see Note 15: Commitments and Contingencies)		6,000
Other current liabilities	22,218	10,242
Total accounts payable and accrued liabilities	$ 80,258	$ 55,201