CONSOLIDATED BALANCE SHEET (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable allowance and reserves	$ 304	$ 286
Accumulated depreciation and amortization on property and equipment	175,459	169,321
Accumulated amortization on intangible assets	$ 15,495	$ 15,551
Common stock authorized (shares)	1,600,000,000	1,600,000,000
Common stock issued (shares)	270,082,027	267,329,284
Common stock outstanding (shares)	270,082,027	267,329,284