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Derivatives (Details)			1 Months Ended	12 Months Ended
Derivatives (Details)	Oct. 04, 2019 USD ($)	Oct. 03, 2019 USD ($)	Feb. 28, 2019 USD ($)	Dec. 31, 2019 USD ($) derivative	Dec. 31, 2018 USD ($) derivative	Mar. 13, 2018	Jan. 01, 2018 USD ($)
Derivative
Payment to terminate derivative instrument	$ 393,900		$ 1,600,000
Unrealized loss included in accumulated other comprehensive loss				$ 200,000
Retained Earnings (Accumulated Deficit) \| ASU 2017-12
Derivative
Cumulative adjustment related to adoption of new accounting pronouncement							$ 231,000
Met Park North
Derivative
Interest Rate				3.71%
Term A Loan \| Unsecured Debt
Derivative
Repayments of term loan		$ 300,000,000.0
Term A Loan \| Minimum \| Unsecured Debt
Derivative
Interest Rate				2.65%
Term A Loan \| Maximum \| Unsecured Debt
Derivative
Interest Rate				3.06%
Term B Loan \| Unsecured Debt
Derivative
Number of Hedges \| derivative				2
Term B Loan \| Minimum \| Unsecured Debt
Derivative
Interest Rate				2.96%
Term B Loan \| Maximum \| Unsecured Debt
Derivative
Interest Rate				3.46%
Term D Loan \| Minimum \| Unsecured Debt
Derivative
Interest Rate				2.63%
Term D Loan \| Maximum \| Unsecured Debt
Derivative
Interest Rate				3.13%
Term Loan A [Member] \| Unsecured Debt
Derivative
Repayments of term loan		300,000,000.0
4.65% Registered senior notes \| Unsecured Debt
Derivative
Stated interest rate				4.65%
Senior Notes Due January 2030 [Member] \| Senior Notes
Derivative
Debt instrument, face amount		$ 400,000,000.0
Designated as Hedging Instrument \| Interest Rate Swaps
Derivative
Number of Hedges \| derivative				4	6
Notional Amount				$ 539,500,000	$ 839,500,000
Fair Value (Liabilities)/Assets				$ (1,312,000)	$ 16,687,000
Designated as Hedging Instrument \| Interest Rate Swaps \| Met Park North
Derivative
Number of Hedges \| derivative				1	1
Notional Amount				$ 64,500,000	$ 64,500,000
Fair Value (Liabilities)/Assets				$ (195,000)	$ 350,000
Designated as Hedging Instrument \| Interest Rate Swaps \| Met Park North \| Minimum
Derivative
Interest Rate				3.71%
Designated as Hedging Instrument \| Interest Rate Swaps \| Met Park North \| Maximum
Derivative
Interest Rate				3.71%
Designated as Hedging Instrument \| Interest Rate Swaps \| Term A Loan
Derivative
Number of Hedges \| derivative					2
Notional Amount					$ 300,000,000
Fair Value (Liabilities)/Assets				$ 0	$ 4,038,000
Designated as Hedging Instrument \| Interest Rate Swaps \| Term A Loan \| Minimum
Derivative
Interest Rate				2.65%		2.75%
Designated as Hedging Instrument \| Interest Rate Swaps \| Term A Loan \| Maximum
Derivative
Interest Rate				3.06%		3.65%
Designated as Hedging Instrument \| Interest Rate Swaps \| Term B Loan
Derivative
Number of Hedges \| derivative				2	2
Notional Amount				$ 350,000,000	$ 350,000,000
Fair Value (Liabilities)/Assets				$ (1,596,000)	$ 7,543,000
Designated as Hedging Instrument \| Interest Rate Swaps \| Term B Loan \| Minimum
Derivative
Interest Rate				2.96%		3.36%
Designated as Hedging Instrument \| Interest Rate Swaps \| Term B Loan \| Maximum
Derivative
Interest Rate				3.46%		4.31%
Designated as Hedging Instrument \| Interest Rate Swaps \| Term D Loan
Derivative
Number of Hedges \| derivative				1	1
Notional Amount				$ 125,000,000	$ 125,000,000
Fair Value (Liabilities)/Assets				$ 479,000	$ 4,756,000
Designated as Hedging Instrument \| Interest Rate Swaps \| Term D Loan \| Minimum
Derivative
Interest Rate				2.63%		3.03%
Designated as Hedging Instrument \| Interest Rate Swaps \| Term D Loan \| Maximum
Derivative
Interest Rate				3.13%		3.98%