Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

v3.7.0.1
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accumulated depreciation and amortization $ 359.6 $ 336.8
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, authorized (in shares) 100,000,000 100,000,000
Common stock, issued (in shares) 28,158,656 27,895,671
Common stock, outstanding (in shares) 27,381,646 27,895,671
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, authorized (in shares) 15,000,000 15,000,000
Preferred stock, issued (in shares) 0 0
Treasury stock (in shares) 777,010