(Loss) Earnings Per Share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential antidilutive securities excluded from future computations of earnings per share, amount (in shares)	1,651,916	2,012,481	1,699,936	1,969,623