Quarterly report pursuant to Section 13 or 15(d)

Earnings (Loss) Per Share of Common Stock (Details)

v3.10.0.1
Earnings (Loss) Per Share of Common Stock (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Net income (loss) $ 10.5 $ 5.4 $ 0.1 $ (2.4)
Denominator        
Weighted average number of common shares outstanding (in shares) 25,759,232 27,638,329 25,748,571 27,779,878
Weighted average number of vested shares not yet issued (in shares) 180,060 108,368 171,487 101,023
Weighted average number of common shares outstanding - Basic (in shares) 25,939,292 27,746,697 25,920,058 27,880,901
Dilutive stock-based compensation awards outstanding (in shares) 55,928 233,641 99,419 0
Weighted average number of common shares outstanding - Diluted (in shares) 25,995,220 27,980,338 26,019,477 27,880,901
Stock compensation performance awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from computation of earnings per share (in shares) 506,255 530,321 716,587 803,432
Performance awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from computation of earnings per share (in shares) 1,119,301 874,337 1,031,082 836,655