Credit Facilities	6 Months Ended
Jun. 30, 2013
Line of Credit Facility [Abstract]
Credit Facilities	Credit Facility Credit Facility The Company and the OP are parties to the Credit Facility with Wells Fargo, National Association, as administrative agent and other lenders party thereto. The Company and the OP succeeded to the Credit Facility upon the consummation of the ARCT III Merger. At June 30, 2013, the Credit Facility has commitments of $1.45 billion. The Credit Facility has an accordion feature, which, if exercised in full, would allow the Company to increase borrowings under the Credit Facility to $2.5 billion, subject to additional lender commitments and borrowing base availability. At June 30, 2013, the Credit Facility contains an $810.0 million term loan facility and a $640.0 million revolving credit facility. Loans under the Credit Facility are priced at the applicable rate (at the Company's election, either a floating interest rate based on one month LIBOR, determined on a daily basis) plus 1.60% to 2.20%, or a prime-based interest rate, based upon the Company’s current leverage. To the extent that the Company receives an investment grade credit rating as determined by a major credit rating agency, at the Company's election, advances under the Credit Facility will be priced at their applicable rate plus 0.90% to 1.75% and term loans will be priced at a floating interest rate of LIBOR plus 1.15% to 2.00%, based upon the Company’s then current investment grade credit rating. The Company may also make fixed rate borrowings under the Credit Facility. As of August 6, 2013, additional commitments from lenders increased available borrowing under the Credit Facility to $1.7 billion, comprised of a $940.0 million term loan facility and a $760.0 million revolving credit facility. The Credit Facility provides for monthly interest payments. In the event of a default, each lender has the right to terminate its obligations under the Credit Facility, and to accelerate the payment on any unpaid principal amount of all outstanding loans. The Company has guaranteed the obligations under the Credit Facility. The revolving credit facility will terminate on February 14, 2017, unless extended, to which the term loan facility will terminate on February 14, 2018. The Company may prepay borrowings under the Credit Facility and, to the extent that borrowings are unused under the revolving credit facility and the term loan facility, the Company incurs an unused fee of 0.15% to 0.25% per annum on the unused amount depending on the unused balance as a percentage of the total facility and the type of funding. The Credit Facility also requires the Company to maintain certain property available for collateral as a condition to funding. As of June 30, 2013, there was $600.0 million outstanding on the Credit Facility, of which $85.0 million bore a floating interest rate of 1.95%, and $515.0 million was fixed at 2.80% through the use of derivative instruments, which are used to hedge against interest rate volatility. At June 30, 2013, there was up to $1.9 billion available to the Company for future borrowings, subject to borrowing availability. The Credit Facility requires the maintenance of financial covenants, as well as restrictions on corporate guarantees, 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. At June 30, 2013, the Company was in compliance with the debt covenants under the Credit Facility. Repayment of Previous Credit Facilities On February 28, 2013, the Company repaid all of the outstanding borrowings under its previous senior secured revolving credit facility in the amount of $124.6 million, and the credit agreement for such facility was terminated. The average interest rate on the borrowings during the period the balance was outstanding was 3.11%. On February 14, 2013, simultaneous with entering into the Credit Facility, the Company terminated its secured credit facility agreement, which had been unused.

Credit Facility

The Company and the OP are parties to the Credit Facility with Wells Fargo, National Association, as administrative agent and other lenders party thereto. The Company and the OP succeeded to the Credit Facility upon the consummation of the ARCT III Merger.

At June 30, 2013, the Credit Facility has commitments of $1.45 billion. The Credit Facility has an accordion feature, which, if exercised in full, would allow the Company to increase borrowings under the Credit Facility to $2.5 billion, subject to additional lender commitments and borrowing base availability.

At June 30, 2013, the Credit Facility contains an $810.0 million term loan facility and a $640.0 million revolving credit facility. Loans under the Credit Facility are priced at the applicable rate (at the Company's election, either a floating interest rate based on one month LIBOR, determined on a daily basis) plus 1.60% to 2.20%, or a prime-based interest rate, based upon the Company’s current leverage. To the extent that the Company receives an investment grade credit rating as determined by a major credit rating agency, at the Company's election, advances under the Credit Facility will be priced at their applicable rate plus 0.90% to 1.75% and term loans will be priced at a floating interest rate of LIBOR plus 1.15% to 2.00%, based upon the Company’s then current investment grade credit rating. The Company may also make fixed rate borrowings under the Credit Facility.

As of August 6, 2013, additional commitments from lenders increased available borrowing under the Credit Facility to $1.7 billion, comprised of a $940.0 million term loan facility and a $760.0 million revolving credit facility.

The Credit Facility provides for monthly interest payments. In the event of a default, each lender has the right to terminate its obligations under the Credit Facility, and to accelerate the payment on any unpaid principal amount of all outstanding loans. The Company has guaranteed the obligations under the Credit Facility. The revolving credit facility will terminate on February 14, 2017, unless extended, to which the term loan facility will terminate on February 14, 2018. The Company may prepay borrowings under the Credit Facility and, to the extent that borrowings are unused under the revolving credit facility and the term loan facility, the Company incurs an unused fee of 0.15% to 0.25% per annum on the unused amount depending on the unused balance as a percentage of the total facility and the type of funding. The Credit Facility also requires the Company to maintain certain property available for collateral as a condition to funding.

As of June 30, 2013, there was $600.0 million outstanding on the Credit Facility, of which $85.0 million bore a floating interest rate of 1.95%, and $515.0 million was fixed at 2.80% through the use of derivative instruments, which are used to hedge against interest rate volatility. At June 30, 2013, there was up to $1.9 billion available to the Company for future borrowings, subject to borrowing availability.

The Credit Facility requires the maintenance of financial covenants, as well as restrictions on corporate guarantees, 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. At June 30, 2013, the Company was in compliance with the debt covenants under the Credit Facility.

Repayment of Previous Credit Facilities

On February 28, 2013, the Company repaid all of the outstanding borrowings under its previous senior secured revolving credit facility in the amount of $124.6 million, and the credit agreement for such facility was terminated. The average interest rate on the borrowings during the period the balance was outstanding was 3.11%. On February 14, 2013, simultaneous with entering into the Credit Facility, the Company terminated its secured credit facility agreement, which had been unused.