Earnings Per Common Share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 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)	1,606,000	2,975,000	1,778,000	2,772,000
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)	1,396,956
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 (in shares)	1,242,081
Weighted-average number of unvested restricted stock units that participated in the distribution of common dividends, unsettled (in shares)			627,890