Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Nominal or face amount used to calculate payments on the derivative asset.

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Fixed interest rate related to the interest rate derivative.

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Derivative Instruments - Narrative (Details)				3 Months Ended
Derivative Instruments - Narrative (Details)	May 03, 2016 USD ($)	Apr. 01, 2015 USD ($) derivative	Jul. 31, 2013 USD ($)	Mar. 31, 2017 USD ($) derivative	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) derivative	Jul. 31, 2016 USD ($) derivative	Jun. 01, 2016	May 01, 2015
Derivative
Notes payable				$ 2,407,196,000		$ 2,707,839,000
Derivative assets				8,558,000		5,935,000
Derivative liabilities				967,000		1,303,000
Cash flow hedge adjustment				3,000,000
Level 2
Derivative
Derivative assets				8,558,000		5,935,000
Derivative liabilities				967,000		1,303,000
Unsecured Debt
Derivative
Notes payable				1,725,000,000		2,025,000,000
5 Year Term Loan Facility 2015 \| Unsecured Debt
Derivative
Debt instrument, term (in years)		5 years
5 Year Term Loan Facility 2015 \| Unsecured Debt \| LIBOR \| Minimum
Derivative
Adjusted interest rate (as a percent)							2.75%		2.66%
5 Year Term Loan Facility 2015 \| Unsecured Debt \| LIBOR \| Maximum
Derivative
Adjusted interest rate (as a percent)							3.65%		3.56%
New Credit Agreement - Term Loan \| Unsecured Debt \| LIBOR \| Minimum
Derivative
Basis spread on variable rate (as a percent)		1.30%
New Credit Agreement - Term Loan \| Unsecured Debt \| LIBOR \| Maximum
Derivative
Basis spread on variable rate (as a percent)		2.20%
7 Year Term Loan Facility 2015 \| Unsecured Debt
Derivative
Number of derivative instruments held (in derivatives) \| derivative							2
Debt instrument, term (in years)		7 years
Face amount		$ 350,000,000
7 Year Term Loan Facility 2015 \| Unsecured Debt \| LIBOR \| Minimum
Derivative
Adjusted interest rate (as a percent)							3.36%		3.21%
7 Year Term Loan Facility 2015 \| Unsecured Debt \| LIBOR \| Maximum
Derivative
Adjusted interest rate (as a percent)							4.31%		4.16%
7-Year Term Loan due November 2022 \| Unsecured Debt
Derivative
Debt instrument, term (in years)	7 years
Notes payable				$ 125,000,000		$ 125,000,000
7-Year Term Loan due November 2022 \| Unsecured Debt \| LIBOR \| Minimum
Derivative
Adjusted interest rate (as a percent)								3.03%
Basis spread on variable rate (as a percent)				1.60%
7-Year Term Loan due November 2022 \| Unsecured Debt \| LIBOR \| Maximum
Derivative
Adjusted interest rate (as a percent)								3.98%
Basis spread on variable rate (as a percent)				2.55%
Met Park North
Derivative
Debt instrument, term (in years)			7 years
Adjusted interest rate (as a percent)				3.71%
Notes payable			$ 64,500,000
Met Park North \| LIBOR
Derivative
Basis spread on variable rate (as a percent)			1.55%
Interest Rate Contract
Derivative
Number of derivative instruments held (in derivatives) \| derivative		2					2
Notional amount		$ 300,000,000					$ 300,000,000
Interest Rate Contract \| 5 Year Term Loan Facility 2015
Derivative
Fixed interest rate (as a percent)									1.36%
Interest Rate Contract \| 7 Year Term Loan Facility 2015
Derivative
Fixed interest rate (as a percent)									1.61%
Unrealized gain on ineffective portion of derivative instruments				$ 6,000
Unrealized loss on ineffective portion of derivative instruments					$ 2,100,000
Interest Rate Contract \| 7-Year Term Loan due November 2022
Derivative
Notional amount	$ 125,000,000
Fixed interest rate (as a percent)	1.43%
Interest Rate Contract \| Met Park North \| LIBOR
Derivative
Interest rate cap (as a percent)			2.16%
Interest Rate Contract, Instrument A \| 5 Year Term Loan Facility 2015
Derivative
Notional amount of interest rate cash flow hedge derivatives		$ 150,000,000.0
Interest Rate Swap \| 7 Year Term Loan Facility 2015 \| Unsecured Debt
Derivative
Number of derivative instruments held (in derivatives) \| derivative		2
Interest Rate Floor \| 7-Year Term Loan due November 2022 \| LIBOR
Derivative
Derivative, interest rate floor (as a percent)	0.00%
Designated as Hedging Instrument \| LIBOR
Derivative
Derivative, interest rate floor (as a percent)							0.00%
Designated as Hedging Instrument \| Interest Rate Cap
Derivative
Number of derivative instruments held (in derivatives) \| derivative				6		6
Notional amount of interest rate cash flow hedge derivatives				$ 839,500,000		$ 839,500,000