Condensed Consolidated Balance Sheets - Parenthetical - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	45,000,000
Common stock, shares issued (in shares)	42,297,000	42,104,000
Common stock, shares outstanding (in shares)	42,297,000	42,104,000