CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	280,000,000	280,000,000
Common stock, shares issued (in shares)	119,767,000	116,838,000
Common stock, shares outstanding (in shares)	114,549,000	115,031,000
Treasury stock, shares (in shares)	5,218,000	1,807,000