Credit Facilities	3 Months Ended
Mar. 31, 2013
Line of Credit Facility [Abstract]
Credit Facilities	Credit Facilities On February14, 2013, ARCT III, entered into the New Credit Facility with Wells Fargo Bank, National Association, as administrative agent, RBS Citizens, N.A. and Regions Bank, as syndication agents, and Capital One, N.A. and JP Morgan Chase Bank, N.A., as documentation agents. Since that date the facility has been augmented to increase the commitments of certain lenders and add Bank of America N.A., Barclays Bank PLC, TD Bank N.A., U.S. Bank N.A., Union Bank N.A., UBS AG, Comerica Bank and First Tennessee Bank, as lenders. These additional commitments increased the facility to $1.45 billion. The New Credit Facility has an accordian feature, which if exercised in full, the aggregate commitments (comprised of revolving, term loan and delayed draw commitments) under the credit agreement would be $2.5 billion, subject to borrowing base availability. The New Credit Facility contains a $810.0 million term loan facility and a $640.0 million revolving credit facility. Loans under the New Credit Facility are priced at a floating interest rate of LIBOR plus 1.60% to 2.20%, 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 New 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 New Credit Facility. The New 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 New 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 New Credit Facility also requires the Company to maintain certain property available for collateral as a condition to funding. As of March 31, 2013, there was $640.0 million outstanding on the New Credit Facility, which bore a floating interest rate, which on March 31, 2013 was 1.96%. $515.0 million of the New Credit Facility's interest rate is fixed at 2.81% through the use of derivative instruments, used to hedge against interest rate volatility. At March 31, 2013, there was up to $1.9 billion available to the Company for future borrowings, subject to borrowing availability. On February 28, 2013, the Company repaid all of the outstanding borrowings under the senior revolving credit facility in the amount of $124.6 million, and the credit agreement 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 ARCT III entering into the New Credit Facility, ARCT III terminated its secured credit facility agreement, which had been unused. The New 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 March 31, 2013 and 2012, the Company was in compliance with the debt covenants under the New Credit Facility.

Credit Facilities

On February14, 2013, ARCT III, entered into the New Credit Facility with Wells Fargo Bank, National Association, as administrative agent, RBS Citizens, N.A. and Regions Bank, as syndication agents, and Capital One, N.A. and JP Morgan Chase Bank, N.A., as documentation agents. Since that date the facility has been augmented to increase the commitments of certain lenders and add Bank of America N.A., Barclays Bank PLC, TD Bank N.A., U.S. Bank N.A., Union Bank N.A., UBS AG, Comerica Bank and First Tennessee Bank, as lenders.

These additional commitments increased the facility to $1.45 billion. The New Credit Facility has an accordian feature, which if exercised in full, the aggregate commitments (comprised of revolving, term loan and delayed draw commitments) under the credit agreement would be $2.5 billion, subject to borrowing base availability.

The New Credit Facility contains a $810.0 million term loan facility and a $640.0 million revolving credit facility. Loans under the New Credit Facility are priced at a floating interest rate of LIBOR plus 1.60% to 2.20%, 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 New 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 New Credit Facility.

The New 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 New 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 New Credit Facility also requires the Company to maintain certain property available for collateral as a condition to funding.

As of March 31, 2013, there was $640.0 million outstanding on the New Credit Facility, which bore a floating interest rate, which on March 31, 2013 was 1.96%. $515.0 million of the New Credit Facility's interest rate is fixed at 2.81% through the use of derivative instruments, used to hedge against interest rate volatility. At March 31, 2013, there was up to $1.9 billion available to the Company for future borrowings, subject to borrowing availability.

On February 28, 2013, the Company repaid all of the outstanding borrowings under the senior revolving credit facility in the amount of $124.6 million, and the credit agreement 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 ARCT III entering into the New Credit Facility, ARCT III terminated its secured credit facility agreement, which had been unused.

The New 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 March 31, 2013 and 2012, the Company was in compliance with the debt covenants under the New Credit Facility.