Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.8.0.1
Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
Preferred stock, par value (in usd per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common Class A    
Common stock, par value (in usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 29,552,750 29,406,315
Common stock, shares outstanding (in shares) 27,467,353 27,533,049
Treasury stock, shares (in shares) 2,085,397 1,873,266
Common Class B    
Common stock, par value (in usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 144,000,000 144,000,000
Common stock, shares issued (in shares) 18,000,000 18,000,000
Common stock, shares outstanding (in shares) 18,000,000 18,000,000