Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	550,000,000	550,000,000
Common stock, shares issued (in shares)	153,241,851	153,430,030
Common stock, shares outstanding (in shares)	149,358,973	151,430,030
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in share)	0	0
Treasury stock (in shares)	3,882,878	2,000,000