Certain Balance Sheet Components (Schedule of Accounts Payable and Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued payroll and benefits	$ 16,080	$ 12,920
Accounts payable	11,382	12,734
Accrued interest	5,488	6,946
Accrued taxes	8,620	6,638
Deferred revenue	4,758	5,514
Operating lease liabilities	4,885	4,998
Other current liabilities	10,182	10,827
Total accounts payable and accrued liabilities	$ 61,395	$ 60,577