Debt - Margin and Commitment Fees Payable (Details)	12 Months Ended
	Dec. 31, 2019
Level I
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.50%
Level I | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Level I | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	4.00%
Level II
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.50%
Level II | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.75%
Level II | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.75%
Level III
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.50%
Level III | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Level III | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.50%
Level IV
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.50%
Level IV | Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.25%
Level IV | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.25%
Maximum | Level II
Debt Instrument [Line Items]
Senior leverage ratio	250.00%
Maximum | Level III
Debt Instrument [Line Items]
Senior leverage ratio	200.00%
Maximum | Level IV
Debt Instrument [Line Items]
Senior leverage ratio	150.00%
Minimum | Level I
Debt Instrument [Line Items]
Senior leverage ratio	250.00%
Minimum | Level II
Debt Instrument [Line Items]
Senior leverage ratio	200.00%
Minimum | Level III
Debt Instrument [Line Items]
Senior leverage ratio	150.00%