Financing Activity - Applicable Credit Spread Over Libor at Various Leverage Levels (Details)	12 Months Ended
	Dec. 31, 2019
Less than 0.450 to 1.00
Debt Instrument [Line Items]
Total liabilities to gross asset value, ratio	0.450
Equal to or greater than 0.450 to 1.00 but less than 0.500 to 1.00 | Minimum
Debt Instrument [Line Items]
Total liabilities to gross asset value, ratio	0.450
Equal to or greater than 0.450 to 1.00 but less than 0.500 to 1.00 | Maximum
Debt Instrument [Line Items]
Total liabilities to gross asset value, ratio	0.500
Equal to or greater than 0.500 to 1.00 but less than 0.550 to 1.00 | Minimum
Debt Instrument [Line Items]
Total liabilities to gross asset value, ratio	0.500
Equal to or greater than 0.500 to 1.00 but less than 0.550 to 1.00 | Maximum
Debt Instrument [Line Items]
Total liabilities to gross asset value, ratio	0.550
Equal to or greater than 0.550 to 1.00
Debt Instrument [Line Items]
Total liabilities to gross asset value, ratio	0.550
LIBOR | Less than 0.450 to 1.00 | Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate	1.20%
LIBOR | Less than 0.450 to 1.00 | Term Loans
Debt Instrument [Line Items]
Stated Interest Rate	1.35%
LIBOR | Equal to or greater than 0.450 to 1.00 but less than 0.500 to 1.00 | Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate	1.25%
LIBOR | Equal to or greater than 0.450 to 1.00 but less than 0.500 to 1.00 | Term Loans
Debt Instrument [Line Items]
Stated Interest Rate	1.45%
LIBOR | Equal to or greater than 0.500 to 1.00 but less than 0.550 to 1.00 | Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate	1.30%
LIBOR | Equal to or greater than 0.500 to 1.00 but less than 0.550 to 1.00 | Term Loans
Debt Instrument [Line Items]
Stated Interest Rate	1.60%
LIBOR | Equal to or greater than 0.550 to 1.00 | Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate	1.55%
LIBOR | Equal to or greater than 0.550 to 1.00 | Term Loans
Debt Instrument [Line Items]
Stated Interest Rate	1.90%
Base Rate | Less than 0.450 to 1.00 | Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate	0.20%
Base Rate | Less than 0.450 to 1.00 | Term Loans
Debt Instrument [Line Items]
Stated Interest Rate	0.35%
Base Rate | Equal to or greater than 0.450 to 1.00 but less than 0.500 to 1.00 | Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate	0.25%
Base Rate | Equal to or greater than 0.450 to 1.00 but less than 0.500 to 1.00 | Term Loans
Debt Instrument [Line Items]
Stated Interest Rate	0.45%
Base Rate | Equal to or greater than 0.500 to 1.00 but less than 0.550 to 1.00 | Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate	0.30%
Base Rate | Equal to or greater than 0.500 to 1.00 but less than 0.550 to 1.00 | Term Loans
Debt Instrument [Line Items]
Stated Interest Rate	0.60%
Base Rate | Equal to or greater than 0.550 to 1.00 | Revolving Credit Facility
Debt Instrument [Line Items]
Stated Interest Rate	0.55%
Base Rate | Equal to or greater than 0.550 to 1.00 | Term Loans
Debt Instrument [Line Items]
Stated Interest Rate	0.90%