Subsequent Events (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Performance-Based LTIP Units
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		567,106	605,072
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Granted, Value, Share-based Compensation, Gross	$ 24.5
Subsequent Event [Member] | Time-Based LTIP Units
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	442,395
Subsequent Event [Member] | Performance-Based LTIP Units
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	477,640