Net Income (Loss) Per Common Share (Dilutive Common Share Equivalents) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average common shares outstanding, basic (in shares)	74,561,019	72,890,313	70,934,937
Effect of dilutive securities (in shares)	3,988,921	0	0
Weighted-average common shares outstanding, diluted (in shares)	78,549,940	72,890,313	70,934,937
Restricted stock units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities (in shares)	1,145,311	0	0
Stock options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities (in shares)	2,843,610	0	0