Net Income (Loss) Per Common Share (Dilutive Common Share Equivalents) (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average common shares outstanding, basic (in shares)	74,148,387	74,561,019	72,890,313
Effect of dilutive securities (in shares)	2,815,362	3,988,921	0
Weighted-average common shares outstanding, diluted (in shares)	76,963,749	78,549,940	72,890,313
RSUs and PRSUs
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities (in shares)	559,257	1,145,311	0
Stock options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities (in shares)	2,234,490	2,843,610	0
Employee stock purchase plan
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities (in shares)	21,615	0	0