Credit Borrowings	6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]
Credit Borrowings	Credit Borrowings Credit Facility On July 25, 2013, the Company, through the OP, entered into a credit facility (the "Credit Facility") that provided for aggregate revolving loan borrowings of up to $50.0 million (subject to borrowing base availability). The Credit Facility has been amended at various times, and maximum borrowings have increased to $740.0 million, with the most recent increase being on August 24, 2015. The Company had $722.1 million (including £160.2 million and €255.7 million) and $616.6 million (including £177.2 million and €258.9 million) outstanding under the Credit Facility as of June 30, 2017 and December 31, 2016, respectively. Availability of borrowings is based on a pool of eligible unencumbered real estate assets. On July 25, 2016, the Company extended the maturity date of the Credit Facility to July 25, 2017, for an extension fee of $1.5 million. The Company had the option, based upon its consolidated leverage ratio, to have draws under the Credit Facility priced at either the Alternate Base Rate (as described below) plus 0.60% to 1.20% or at Adjusted LIBOR (as described below) plus 1.60% to 2.20%. The Alternate Base Rate was defined in the Credit Facility as a rate per annum equal to the greatest of (a) the fluctuating annual rate of interest announced from time to time by the lender as its “prime rate” in effect on such day, (b) the federal funds effective rate in effect on such day plus half of 1% and (c) the Adjusted LIBOR for a one-month interest period on such day plus 1%. Adjusted LIBOR was defined as LIBOR multiplied by the statutory reserve rate, as determined by the Federal Reserve System of the United States. The Credit Facility agreement required the Company to pay an unused fee per annum of 0.25% if the unused balance of the Credit Facility exceeded or was equal to 50% of the available facility or a fee per annum of 0.15% if the unused balance of the Credit Facility is less than 50% of the available facility. As of June 30, 2017, the Credit Facility reflected variable and fixed rate borrowings with a carrying value and fair value of $722.1 million, and a weighted average effective interest rate of 2.7% after giving effect to interest rate swaps in place. The unused borrowing capacity under the Credit Facility as of June 30, 2017 and December 31, 2016 was $4.8 million and $113.0 million, respectively. The Credit Facility agreement provided for quarterly interest payments for each Alternate Base Rate loan and periodic payments for each Adjusted LIBOR loan, based upon the applicable LIBOR loan period, with all principal outstanding being due on the extended maturity date in July 2017. The Credit Facility agreement was permitted to be prepaid at any time, in whole or in part, without premium or penalty, subject to prior notice to the lender. In the event of a default, the lender had the right to terminate its obligations under the Credit Facility agreement and to accelerate the payment on any unpaid principal amount of all outstanding loans. The Credit Facility required the Company to meet certain financial covenants, including the maintenance of certain financial ratios (such as specified debt to equity and debt service coverage ratios) as well as the maintenance of a minimum net worth. As of June 30, 2017, the Company was in compliance with the financial covenants under the Credit Facility. A portion of foreign currency draws under the Credit Facility are designated as net investment hedges of the Company's investments during the periods reflected in the consolidated statements of operations (see Note 8 — Derivatives and Hedging Activities for further discussion). On July 24, 2017, the Company terminated the Credit Facility and repaid the outstanding balance of $725.8 million (including €255.7 million, £160.2 million, and $221.6 million) of which $720.9 million was repaid with proceeds from the New Credit Facility (as described below) and $4.9 million from cash on hand. Revolving and Term Loan Credit Facility On July 24, 2017, the Company, through the OP, entered into a credit agreement with KeyBank National Association (“KeyBank”), as agent, and the other lender parties thereto, that provides for a $500.0 million senior unsecured multi-currency revolving credit facility (the “Revolving Credit Facility”) and a €194.6 million ($225.0 million U.S. Dollar ("USD") equivalent) senior unsecured term loan facility (the “Term Facility” and, together with the Revolving Credit Facility, the “New Credit Facility”). The aggregate total commitments under the New Credit Facility are $725.0 million based on USD equivalents. Upon request of the Company, subject in all respects to the consent of the lenders in their sole discretion, these aggregate total commitments may be increased up to an aggregate additional amount of $225.0 million, allocated to either or among both portions of the New Credit Facility, with total commitments under the New Credit Facility not to exceed $950.0 million. The Revolving Credit Facility is interest-only and matures on July 24, 2021, subject to one one-year extension at the Company’s option. The Term Facility is interest-only and matures on July 24, 2022. Borrowings under the New Credit Facility bear interest at a variable rate per annum based on an applicable margin that varies based on the ratio of consolidated total indebtedness and the consolidated total asset value of the Company and its subsidiaries plus either (i) LIBOR, as applicable to the currency being borrowed, or (ii) a “base rate” equal to the greatest of (a) KeyBank’s “prime rate,” (b) 0.5% above the Federal Funds Effective Rate or (c) 1.0% above one-month LIBOR. The applicable interest rate margin will initially be determined based on a range from 0.60% to 1.20% per annum with respect to base rate borrowings and 1.60% to 2.20% per annum with respect to LIBOR borrowings. The New Credit Facility requires the Company through the OP to pay an unused fee per annum of 0.25% of the unused balance of the Revolving Credit Facility if the unused balance exceeds or is equal to 50% of the total commitment or a fee per annum of 0.15% of the unused balance of the Revolving Credit Facility if the unused balance is less than 50% of the total commitment. From and after the time the Company obtains an investment grade credit rating, the unused fee will be replaced with a facility fee based on the total commitment under the Revolving Credit Facility multiplied by 0.30%, decreasing as the Company’s credit rating increases. The availability of borrowings under the Revolving Credit Facility is based on the value of a pool of eligible unencumbered real estate assets owned by the Company and compliance with various ratios related to those assets. The Company, through the OP, may reduce the amount committed under the Revolving Credit Facility and repay outstanding borrowings under the New Credit Facility, in whole or in part, at any time without premium or penalty, other than customary “breakage” costs payable on LIBOR borrowings. In the event of a default, the lender has the right to terminate its obligations under the New Credit Facility agreement and to accelerate the payment on any unpaid principal amount of all outstanding loans. The New Credit Facility also imposes certain affirmative and negative covenants on the OP, the Company and certain of its subsidiaries including restrictive covenants with respect to, among other things, liens, indebtedness, investments, distributions, mergers and asset sales, as well as financial covenants requiring the OP to maintain, among other things, ratios related to leverage, secured leverage, fixed charge coverage and unencumbered debt services, as well as a minimum consolidated tangible net worth. The Company and certain of its subsidiaries have guaranteed the OP's obligations under the New Credit Facility pursuant to a guarantee and a related contribution agreement which governs contribution rights of the guarantors in the event any amounts become payable under the guaranty. At closing, the Company, through the OP, borrowed $720.9 million based on USD equivalent consisting of (i) €194.6 million ($225.0 million USD equivalent) borrowed under the Term Facility and (ii) $409.0 million, £40.0 million ($52.2 million USD equivalent) and €30.0 million ($34.7 million USD equivalent) borrowed under the Revolving Credit Facility. The proceeds from the New Credit Facility, along with $4.9 million from cash on hand, were used to repay the $725.8 million of indebtedness outstanding under the Credit Facility. The availability of borrowings under the Revolving Credit Facility is based on the value of a pool of eligible unencumbered real estate assets owned by the Company and compliance with various ratios related to those assets. Following the closing, $4.1 million was available for future borrowings under the Revolving Credit Facility. Any future borrowings may, at the option of the Company, be denominated in USD, Euros, Canadian Dollars, British Pounds Sterling or Swiss Francs. Amounts borrowed may not, however, be converted to, or repaid in, another currency once incurred. In connection with the Company’s replacement of its existing Credit Facility with its New Credit Facility, and the change in borrowings by currency resulting therefrom, the Company terminated its existing £160.3 million notional GBP-LIBOR interest rate swap and entered into a new $150.0 million notional five year USD-LIBOR interest rate swap. Additionally, the Company novated its existing €224.4 million notional Euribor interest rate swap from its existing counterparty to a new counterparty. Bridge Loan Facility On August 8, 2016, in connection with the execution of the Merger Agreement, the OP entered into a bridge loan commitment letter (the "Bridge Commitment"), pursuant to which UBS Securities LLC and UBS AG, Stamford Branch agreed to provide a $150.0 million senior secured bridge loan facility for a term of 364 days from the date of the merger transaction. The Bridge Commitment required a 1.50% fee of the commitment amount upon execution. Upon closing of the Merger, the Company did not exercise its rights under the Bridge Commitment and as a result thereof, the Bridge Commitment was automatically terminated with the Merger. Mezzanine Facility In connection with the Merger, the Company assumed a mezzanine loan agreement (the "Mezzanine Facility") with an estimated aggregate fair value of $107.0 million. The Mezzanine Facility, which provided for aggregate borrowings up to €128.0 million subject to certain conditions. The Mezzanine Facility bore interest at a rate of 8.25% per annum, payable quarterly, and was scheduled to mature on August 13, 2017. On March 30, 2017, the Company terminated the Mezzanine Facility agreement and repaid in full the outstanding balance of $56.5 million (or €52.7 million). The outstanding balance of the Mezzanine Facility was $55.4 million (or €52.7 million) as of December 31, 2016. The Company had no unused borrowing capacity under the Mezzanine Facility as of December 31, 2016. Unencumbered Assets The total gross carrying value of unencumbered assets as of June 30, 2017 was $1.5 billion.

Credit Borrowings

Credit Facility

On July 25, 2013, the Company, through the OP, entered into a credit facility (the "Credit Facility") that provided for aggregate revolving loan borrowings of up to $50.0 million (subject to borrowing base availability). The Credit Facility has been amended at various times, and maximum borrowings have increased to $740.0 million, with the most recent increase being on August 24, 2015. The Company had $722.1 million (including £160.2 million and €255.7 million) and $616.6 million (including £177.2 million and €258.9 million) outstanding under the Credit Facility as of June 30, 2017 and December 31, 2016, respectively.

Availability of borrowings is based on a pool of eligible unencumbered real estate assets. On July 25, 2016, the Company extended the maturity date of the Credit Facility to July 25, 2017, for an extension fee of $1.5 million.

The Company had the option, based upon its consolidated leverage ratio, to have draws under the Credit Facility priced at either the Alternate Base Rate (as described below) plus 0.60% to 1.20% or at Adjusted LIBOR (as described below) plus 1.60% to 2.20%. The Alternate Base Rate was defined in the Credit Facility as a rate per annum equal to the greatest of (a) the fluctuating annual rate of interest announced from time to time by the lender as its “prime rate” in effect on such day, (b) the federal funds effective rate in effect on such day plus half of 1% and (c) the Adjusted LIBOR for a one-month interest period on such day plus 1%. Adjusted LIBOR was defined as LIBOR multiplied by the statutory reserve rate, as determined by the Federal Reserve System of the United States. The Credit Facility agreement required the Company to pay an unused fee per annum of 0.25% if the unused balance of the Credit Facility exceeded or was equal to 50% of the available facility or a fee per annum of 0.15% if the unused balance of the Credit Facility is less than 50% of the available facility. As of June 30, 2017, the Credit Facility reflected variable and fixed rate borrowings with a carrying value and fair value of $722.1 million, and a weighted average effective interest rate of 2.7% after giving effect to interest rate swaps in place. The unused borrowing capacity under the Credit Facility as of June 30, 2017 and December 31, 2016 was $4.8 million and $113.0 million, respectively.

The Credit Facility agreement provided for quarterly interest payments for each Alternate Base Rate loan and periodic payments for each Adjusted LIBOR loan, based upon the applicable LIBOR loan period, with all principal outstanding being due on the extended maturity date in July 2017. The Credit Facility agreement was permitted to be prepaid at any time, in whole or in part, without premium or penalty, subject to prior notice to the lender. In the event of a default, the lender had the right to terminate its obligations under the Credit Facility agreement and to accelerate the payment on any unpaid principal amount of all outstanding loans. The Credit Facility required the Company to meet certain financial covenants, including the maintenance of certain financial ratios (such as specified debt to equity and debt service coverage ratios) as well as the maintenance of a minimum net worth. As of June 30, 2017, the Company was in compliance with the financial covenants under the Credit Facility.

A portion of foreign currency draws under the Credit Facility are designated as net investment hedges of the Company's investments during the periods reflected in the consolidated statements of operations (see Note 8 — Derivatives and Hedging Activities for further discussion).

On July 24, 2017, the Company terminated the Credit Facility and repaid the outstanding balance of $725.8 million (including €255.7 million, £160.2 million, and $221.6 million) of which $720.9 million was repaid with proceeds from the New Credit Facility (as described below) and $4.9 million from cash on hand.

Revolving and Term Loan Credit Facility

On July 24, 2017, the Company, through the OP, entered into a credit agreement with KeyBank National Association (“KeyBank”), as agent, and the other lender parties thereto, that provides for a $500.0 million senior unsecured multi-currency revolving credit facility (the “Revolving Credit Facility”) and a €194.6 million ($225.0 million U.S. Dollar ("USD") equivalent) senior unsecured term loan facility (the “Term Facility” and, together with the Revolving Credit Facility, the “New Credit Facility”). The aggregate total commitments under the New Credit Facility are $725.0 million based on USD equivalents. Upon request of the Company, subject in all respects to the consent of the lenders in their sole discretion, these aggregate total commitments may be increased up to an aggregate additional amount of $225.0 million, allocated to either or among both portions of the New Credit Facility, with total commitments under the New Credit Facility not to exceed $950.0 million.

The Revolving Credit Facility is interest-only and matures on July 24, 2021, subject to one one-year extension at the Company’s option. The Term Facility is interest-only and matures on July 24, 2022. Borrowings under the New Credit Facility bear interest at a variable rate per annum based on an applicable margin that varies based on the ratio of consolidated total indebtedness and the consolidated total asset value of the Company and its subsidiaries plus either (i) LIBOR, as applicable to the currency being borrowed, or (ii) a “base rate” equal to the greatest of (a) KeyBank’s “prime rate,” (b) 0.5% above the Federal Funds Effective Rate or (c) 1.0% above one-month LIBOR. The applicable interest rate margin will initially be determined based on a range from 0.60% to 1.20% per annum with respect to base rate borrowings and 1.60% to 2.20% per annum with respect to LIBOR borrowings.

The New Credit Facility requires the Company through the OP to pay an unused fee per annum of 0.25% of the unused balance of the Revolving Credit Facility if the unused balance exceeds or is equal to 50% of the total commitment or a fee per annum of 0.15% of the unused balance of the Revolving Credit Facility if the unused balance is less than 50% of the total commitment. From and after the time the Company obtains an investment grade credit rating, the unused fee will be replaced with a facility fee based on the total commitment under the Revolving Credit Facility multiplied by 0.30%, decreasing as the Company’s credit rating increases.

The Company, through the OP, may reduce the amount committed under the Revolving Credit Facility and repay outstanding borrowings under the New Credit Facility, in whole or in part, at any time without premium or penalty, other than customary “breakage” costs payable on LIBOR borrowings. In the event of a default, the lender has the right to terminate its obligations under the New Credit Facility agreement and to accelerate the payment on any unpaid principal amount of all outstanding loans. The New Credit Facility also imposes certain affirmative and negative covenants on the OP, the Company and certain of its subsidiaries including restrictive covenants with respect to, among other things, liens, indebtedness, investments, distributions, mergers and asset sales, as well as financial covenants requiring the OP to maintain, among other things, ratios related to leverage, secured leverage, fixed charge coverage and unencumbered debt services, as well as a minimum consolidated tangible net worth.

The Company and certain of its subsidiaries have guaranteed the OP's obligations under the New Credit Facility pursuant to a guarantee and a related contribution agreement which governs contribution rights of the guarantors in the event any amounts become payable under the guaranty.

At closing, the Company, through the OP, borrowed $720.9 million based on USD equivalent consisting of (i) €194.6 million ($225.0 million USD equivalent) borrowed under the Term Facility and (ii) $409.0 million, £40.0 million ($52.2 million USD equivalent) and €30.0 million ($34.7 million USD equivalent) borrowed under the Revolving Credit Facility. The proceeds from the New Credit Facility, along with $4.9 million from cash on hand, were used to repay the $725.8 million of indebtedness outstanding under the Credit Facility.

The availability of borrowings under the Revolving Credit Facility is based on the value of a pool of eligible unencumbered real estate assets owned by the Company and compliance with various ratios related to those assets. Following the closing, $4.1 million was available for future borrowings under the Revolving Credit Facility. Any future borrowings may, at the option of the Company, be denominated in USD, Euros, Canadian Dollars, British Pounds Sterling or Swiss Francs. Amounts borrowed may not, however, be converted to, or repaid in, another currency once incurred.

In connection with the Company’s replacement of its existing Credit Facility with its New Credit Facility, and the change in borrowings by currency resulting therefrom, the Company terminated its existing £160.3 million notional GBP-LIBOR interest rate swap and entered into a new $150.0 million notional five year USD-LIBOR interest rate swap. Additionally, the Company novated its existing €224.4 million notional Euribor interest rate swap from its existing counterparty to a new counterparty.

Bridge Loan Facility

On August 8, 2016, in connection with the execution of the Merger Agreement, the OP entered into a bridge loan commitment letter (the "Bridge Commitment"), pursuant to which UBS Securities LLC and UBS AG, Stamford Branch agreed to provide a $150.0 million senior secured bridge loan facility for a term of 364 days from the date of the merger transaction. The Bridge Commitment required a 1.50% fee of the commitment amount upon execution. Upon closing of the Merger, the Company did not exercise its rights under the Bridge Commitment and as a result thereof, the Bridge Commitment was automatically terminated with the Merger.

Mezzanine Facility

In connection with the Merger, the Company assumed a mezzanine loan agreement (the "Mezzanine Facility") with an estimated aggregate fair value of $107.0 million. The Mezzanine Facility, which provided for aggregate borrowings up to €128.0 million subject to certain conditions. The Mezzanine Facility bore interest at a rate of 8.25% per annum, payable quarterly, and was scheduled to mature on August 13, 2017.

On March 30, 2017, the Company terminated the Mezzanine Facility agreement and repaid in full the outstanding balance of $56.5 million (or €52.7 million). The outstanding balance of the Mezzanine Facility was $55.4 million (or €52.7 million) as of December 31, 2016. The Company had no unused borrowing capacity under the Mezzanine Facility as of December 31, 2016.

Unencumbered Assets

The total gross carrying value of unencumbered assets as of June 30, 2017 was $1.5 billion.