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Derivatives (Details) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 03, 2016 USD ($) | Apr. 01, 2015 USD ($) derivative | Jul. 31, 2013 USD ($) | Dec. 31, 2017 USD ($) derivative | Dec. 31, 2016 USD ($) derivative | Dec. 31, 2015 USD ($) | Jul. 31, 2016 USD ($) derivative | Jun. 30, 2016 | Jun. 01, 2016 | May 01, 2015
Derivative |  |  |  |  |  |  |  |  |  |
Loss recognized related to ineffective portion of derivative contracts |  |  |  | $ 70,000 | $ 1,400,000 | $ 0 |  |  |  |
Notes payable |  |  |  | 2,439,311,000 |  |  |  |  |  |
Derivative assets |  |  |  | 12,586,000 | 5,935,000 |  |  |  |  |
Derivative liabilities |  |  |  | 265,000 | 1,303,000 |  |  |  |  |
Unrealized gain included in accumulated other comprehensive loss |  |  |  | $ 1,500,000 |  | $ 2,597,000 |  |  |  |
Met Park North |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 7 years |  |  |  |  |  |  |
Fixed interest rate percentage |  |  |  | 371.00% |  |  |  |  |  |
Notes payable |  |  | $ 64,500,000 |  |  |  |  |  |  |
Met Park North | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.55% |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  | $ 1,975,000,000 | 2,025,000,000 |  |  |  |  |
Unsecured Debt | 5-Year Term Loan due April 2020 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Debt instrument term |  | 5 years |  |  |  |  |  |  |  |
Notes payable |  |  |  | $ 300,000,000 | 450,000,000 |  |  |  |  |
Unsecured Debt | 5-Year Term Loan due April 2020 | Minimum |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Fixed interest rate percentage |  |  |  |  |  |  | 2.75% |  |  | 2.66%
Unsecured Debt | 5-Year Term Loan due April 2020 | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.30% |  |  |  |  |  |
Unsecured Debt | 5-Year Term Loan due April 2020 | Maximum |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Fixed interest rate percentage |  |  |  |  |  |  | 3.65% |  |  | 3.56%
Unsecured Debt | 5-Year Term Loan due April 2020 | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.20% |  |  |  |  |  |
Unsecured Debt | 7 Year Term Loan Facility 2015 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Debt instrument term |  | 7 years |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 350,000,000.0 |  |  |  |  |  |  |  |
Unsecured Debt | 7 Year Term Loan Facility 2015 | Minimum |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Fixed interest rate percentage |  |  |  |  |  |  | 3.36% |  |  | 3.21%
Unsecured Debt | 7 Year Term Loan Facility 2015 | Maximum |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Fixed interest rate percentage |  |  |  |  |  |  | 4.31% |  |  | 4.16%
Unsecured Debt | 7-Year Term Loan due November 2022 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Debt instrument term | 7 years |  |  |  |  |  |  |  |  |
Notes payable |  |  |  | $ 125,000,000 | $ 125,000,000 |  |  |  |  |
Unsecured Debt | 7-Year Term Loan due November 2022 | Minimum |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Fixed interest rate percentage |  |  |  |  |  |  |  | 3.03% |  |
Unsecured Debt | 7-Year Term Loan due November 2022 | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.60% |  |  |  |  |  |
Unsecured Debt | 7-Year Term Loan due November 2022 | Maximum |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Fixed interest rate percentage |  |  |  |  |  |  |  | 3.98% |  |
Unsecured Debt | 7-Year Term Loan due November 2022 | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.55% |  |  |  |  |  |
Designated as Hedging Instrument | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Derivative, floor interest rate |  |  |  |  |  |  | 0.00% |  |  |
Interest Rate Caps | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  |  |  | 6 | 6 |  |  |  |  |
Notional amount |  |  |  | $ 839,500,000 | $ 83,900,000 |  |  |  |  |
Interest Rate Swaps | 7 Year Term Loan Facility 2015 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  | 1.61%
Interest Rate Swaps | Unsecured Debt | 7 Year Term Loan Facility 2015 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  | 2 |  |  |  |  |  |  |  |
Interest Rate Contract |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  | 2 |  |  |  |  |  |  |  |
Derivative asset notional amount |  | $ 300,000,000.0 |  |  |  |  | $ 300,000,000.0 |  |  |
Interest Rate Contract | 5-Year Term Loan due April 2020 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Number of derivative instruments held | derivative |  |  |  |  |  |  | 2 |  |  |
Interest Rate Contract | 7-Year Term Loan due November 2022 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Derivative asset notional amount | $ 125,000,000.0 |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  | 1.43% |
Interest Rate Contract | Met Park North | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Interest rate cap |  |  | 2.16% |  |  |  |  |  |  |
Interest Rate Contract | Not Designated as Hedging Instrument | 5-Year Term Loan due April 2020 | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.30% |  |  |  |  |  |  |  |
Interest Rate Contract | Not Designated as Hedging Instrument | 5-Year Term Loan due April 2020 | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.20% |  |  |  |  |  |  |  |
Interest Rate Contract, Instrument A | 5-Year Term Loan due April 2020 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 150,000,000.0 |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  | 1.36%
Interest Rate Contract, Instrument B | 5-Year Term Loan due April 2020 |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 150,000,000 |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  | 1.36%
Interest Rate Floor | 7-Year Term Loan due November 2022 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |  |  |  |
Derivative, floor interest rate | 0.00% |  |  |  |  |  |  |  |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition The portion of losses 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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