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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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Fixed interest rate related to the interest rate derivative.

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Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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The number of derivative instruments of a particular group held by the entity.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Derivative Instruments - Narrative (Details)				3 Months Ended		6 Months Ended
Derivative Instruments - Narrative (Details)	May 03, 2016 USD ($)	Apr. 01, 2015 USD ($) derivative	Jul. 31, 2013 USD ($)	Jun. 30, 2017 USD ($) derivative	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) derivative	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) derivative	Jul. 31, 2016 USD ($) derivative	Jun. 01, 2016	May 01, 2015
Derivative
Notes payable				$ 2,616,568,000		$ 2,616,568,000		$ 2,707,839,000
Derivative assets				5,858,000		5,858,000		5,935,000
Derivative liabilities				987,000		987,000		1,303,000
Cash flow hedge adjustment						1,900,000
Level 2
Derivative
Derivative assets				5,858,000		5,858,000		5,935,000
Derivative liabilities				987,000		987,000		1,303,000
Unsecured Debt
Derivative
Notes payable				1,935,000,000		$ 1,935,000,000		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 \| Minimum
Derivative
Adjusted interest rate (as a percent)									2.75%		2.66%
5 Year Term Loan Facility 2015 \| Unsecured Debt \| 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 \| Minimum
Derivative
Adjusted interest rate (as a percent)									3.36%		3.21%
7 Year Term Loan Facility 2015 \| Unsecured Debt \| 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					7 years
Notes payable				$ 125,000,000		$ 125,000,000		$ 125,000,000
7-Year Term Loan due November 2022 \| Unsecured Debt \| Minimum
Derivative
Adjusted interest rate (as a percent)										3.03%
7-Year Term Loan due November 2022 \| Unsecured Debt \| Maximum
Derivative
Adjusted interest rate (as a percent)										3.98%
7-Year Term Loan due November 2022 \| Unsecured Debt \| LIBOR \| Minimum
Derivative
Basis spread on variable rate (as a percent)						1.60%
7-Year Term Loan due November 2022 \| Unsecured Debt \| LIBOR \| Maximum
Derivative
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%		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 (loss) on derivative, ineffective portion				$ 51,000	$ 400,000	$ 45,000	$ 2,500,000
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		6
Notional amount of interest rate cash flow hedge derivatives				$ 839,500,000		$ 839,500,000		$ 839,500,000