Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 5,494	$ 3,542
Inventory, allowance	$ 76	$ 152
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized	596,950	596,950
Common stock, shares issued	315,808	309,736
Common stock, shares outstanding	242,849	239,743
Treasury stock, shares	72,959	69,993
Accumulated Depreciation, Property, Plant, and Equipment	$ 109,646	$ 104,999
Accumulated Amortization, Software	102,133	100,870
Accumulated Amortization, Intangible Assets	$ 221,182	$ 162,788