Earnings Per Common Share - Narrative (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average number of unvested restricted stock units that participated in the distribution of common dividends (in shares)	1,533,000	2,610,000	1,696,000	2,730,000
Restricted Stock Units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average number of unvested restricted stock units that participated in the distribution of common dividends (in shares)	1,403,886		1,236,311
Restricted Stock Units, Vested
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average number of unvested restricted stock units that participated in the distribution of common dividends, unsettled (in shares)	627,890		627,890