Secured Notes Payable and Revolving Credit Facility(Schedule Of Secured Notes Payable and Revolving Credit Facility) (Details) | Oct. 13, 2015USD ($) | Sep. 30, 2015USD ($)extension_optionRate | Dec. 31, 2014USD ($) |
Debt Instrument [Line Items] | | | |
Aggregate term loan principal | | $ 3,474,111,000 | $ 3,253,290,000 |
Total future principal payments | | $ 3,474,111,000 | 3,435,290,000 |
Weighted average remaining life of outstanding term debt | | 3 years 12 months | |
Debt at fixed interest rate | | $ 3,190,000,000 | |
Weighted average remaining life of interest rate swaps and fixed rate debt (in years) | | 4 years 2 months | |
Weighted average interest rate for fixed & effectively fixed rate debt | | 3.80% | |
Effective weighted average interest rate for fixed & effectively fixed rate debt | | 3.92% | |
Ownership percentage in joint ventures | | 66.67% | |
Aggregate Swap Fixed Rate Loans [Member] | | | |
Debt Instrument [Line Items] | | | |
Total future principal payments | | $ 2,050,480,000 | 1,828,080,000 |
Effective fixed rate, percent | | 3.60% | |
Aggregate Fixed Rate Loans [Member] | | | |
Debt Instrument [Line Items] | | | |
Total future principal payments | | $ 1,142,491,000 | 1,144,070,000 |
Effective fixed rate, percent | | 4.15% | |
Weighted average life of fixed interest rate on effectively fixed & fixed rate debt | | 2 years 5 months | |
Aggregate Floating Rate Loans [Member] | | | |
Debt Instrument [Line Items] | | | |
Total future principal payments | | $ 281,140,000 | 463,140,000 |
Term Loan With Maturity Date 12/24/2015 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Dec. 24, 2015 | |
Total future principal payments | | $ 20,000,000 | 20,000,000 |
Variable Interest Rate | | LIBOR + 1.45% | |
DEG III Term Loan With Maturity Date 3/1/16 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Mar. 1, 2016 | |
Total future principal payments | | $ 16,140,000 | 16,140,000 |
Variable Interest Rate | | LIBOR + 1.60% | |
Ownership percentage in joint ventures | | 66.67% | |
Term Loan With Maturity Date 3/1/2016 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Mar. 1, 2016 | |
Total future principal payments | | $ 82,000,000 | 82,000,000 |
Variable Interest Rate | | LIBOR + 0.62% | |
Term Loan With Maturity Date 6/1/2017 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Jun. 1, 2017 | |
Total future principal payments | | $ 18,000,000 | 18,000,000 |
Variable Interest Rate | | LIBOR + 0.62% | |
Term Loan With Maturity Date 10/2/2017 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Oct. 2, 2017 | |
Total future principal payments | | $ 0 | $ 400,000,000 |
Variable Interest Rate | | LIBOR + 2.00% | |
Derivative, Fixed Interest Rate | | | 4.45% |
Swap Maturity Date | | Jul. 1, 2015 | |
Term Loan With Maturity Date 4/2/2018 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Apr. 2, 2018 | |
Total future principal payments | | $ 510,000,000 | $ 510,000,000 |
Variable Interest Rate | | LIBOR + 2.00% | |
Derivative, Fixed Interest Rate | | | 4.12% |
Swap Maturity Date | | Apr. 1, 2016 | |
Term Loan With Maturity Date 8/1/2018 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Aug. 1, 2018 | |
Total future principal payments | | $ 530,000,000 | $ 530,000,000 |
Variable Interest Rate | | LIBOR + 1.70% | |
Derivative, Fixed Interest Rate | | | 3.74% |
Swap Maturity Date | | Aug. 1, 2016 | |
Term Loan With Maturity Date 8/5/2018 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Aug. 5, 2018 | |
Total future principal payments | | $ 355,000,000 | $ 355,000,000 |
Long-term Debt, Fixed Interest Rate | | | 4.14% |
Debt instrument period of monthly interest-only payments end date | | Feb. 5, 2016 | |
Fixed rate debt amortization period | | 30 years | |
Term Loan With Maturity Date 2/1/2019 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Feb. 1, 2019 | |
Total future principal payments | | $ 153,421,000 | $ 155,000,000 |
Long-term Debt, Fixed Interest Rate | | | 4.00% |
Fixed rate debt amortization period | | 30 years | |
Term Loan With Maturity Date 6/5/2019 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Jun. 5, 2019 | |
Total future principal payments | | $ 285,000,000 | $ 285,000,000 |
Long-term Debt, Fixed Interest Rate | | | 3.85% |
Debt instrument period of monthly interest-only payments end date | | Feb. 5, 2017 | |
Fixed rate debt amortization period | | 30 years | |
Term Loan With Maturity Date 10/1/2019 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Oct. 1, 2019 | |
Total future principal payments | | $ 145,000,000 | $ 145,000,000 |
Variable Interest Rate | | LIBOR + 1.25% | |
Term Loan With Maturity Date 3/1/2020 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Mar. 1, 2020 | |
Total future principal payments | | $ 349,070,000 | $ 349,070,000 |
Long-term Debt, Fixed Interest Rate | | | 4.46% |
Debt instrument period of monthly interest-only payments end date | | May 1, 2016 | |
Fixed rate debt amortization period | | 30 years | |
Debt instrument period of fixed interest end date | | Mar. 1, 2018 | |
Number of one-year extension options | extension_option | | 2 | |
Term Loan With Maturity Date 11/2/2020 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Nov. 2, 2020 | |
Total future principal payments | | $ 388,080,000 | $ 388,080,000 |
Variable Interest Rate | | LIBOR + 1.65% | |
Derivative, Fixed Interest Rate | | | 3.65% |
Swap Maturity Date | | Nov. 1, 2017 | |
Term Loan With Maturity Date 4/15/2022 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Apr. 15, 2022 | |
Total future principal payments | | $ 340,000,000 | $ 0 |
Variable Interest Rate | | LIBOR + 1.40% | |
Derivative, Fixed Interest Rate | | | 2.77% |
Swap Maturity Date | | Apr. 1, 2020 | |
Term Loan With Maturity Date 7/27/2022 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Jul. 27, 2022 | |
Total future principal payments | | $ 180,000,000 | $ 0 |
Variable Interest Rate | | LIBOR + 1.45% | |
Derivative, Fixed Interest Rate | | | 3.06% |
Swap Maturity Date | | Jul. 1, 2020 | |
Potential term extension | | 2 years | |
Term Loan With Maturity Date 4/01/2025 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Apr. 1, 2025 | |
Total future principal payments | | $ 102,400,000 | $ 0 |
Variable Interest Rate | | LIBOR + 1.25% | |
Derivative, Fixed Interest Rate | | | 2.84% |
Swap Maturity Date | | Mar. 1, 2020 | |
Revolving Credit Facility With Maturity Date 12/11/17 [Member] | | | |
Debt Instrument [Line Items] | | | |
Maturity Date | | Aug. 21, 2020 | |
Revolving credit line | | $ 0 | $ 182,000,000 |
Variable Interest Rate | | LIBOR + 1.40% | |
Maximum borrowing capacity | | $ 400,000,000 | |
LIBOR [Member] | Term Loan With Maturity Date 12/24/2015 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.45% | |
LIBOR [Member] | DEG III Term Loan With Maturity Date 3/1/16 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.60% | |
LIBOR [Member] | Term Loan With Maturity Date 3/1/2016 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 0.62% | |
LIBOR [Member] | Term Loan With Maturity Date 6/1/2017 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 0.62% | |
LIBOR [Member] | Term Loan With Maturity Date 10/2/2017 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 2.00% | |
LIBOR [Member] | Term Loan With Maturity Date 4/2/2018 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 2.00% | |
LIBOR [Member] | Term Loan With Maturity Date 8/1/2018 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.70% | |
LIBOR [Member] | Term Loan With Maturity Date 10/1/2019 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.25% | |
LIBOR [Member] | Term Loan With Maturity Date 11/2/2020 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.65% | |
LIBOR [Member] | Term Loan With Maturity Date 4/15/2022 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.40% | |
LIBOR [Member] | Term Loan With Maturity Date 7/27/2022 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.45% | |
LIBOR [Member] | Term Loan With Maturity Date 4/01/2025 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.25% | |
LIBOR [Member] | Revolving Credit Facility With Maturity Date 12/11/17 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | | 1.40% | |
outstanding principal is greater than $100,000,000 [Member] | Revolving Credit Facility With Maturity Date 12/11/17 [Member] | | | |
Debt Instrument [Line Items] | | | |
Unused commitment fees | Rate | | 0.15% | |
outstanding principal is less than $100,000,000 [Member] | Revolving Credit Facility With Maturity Date 12/11/17 [Member] | | | |
Debt Instrument [Line Items] | | | |
Unused commitment fees | Rate | | 0.20% | |
Subsequent Event [Member] | Term Loan With Maturity Date 4/2/2018 [Member] | | | |
Debt Instrument [Line Items] | | | |
Payments on loan due | $ 254,000,000 | | |
Subsequent Event [Member] | Term Loan With Maturity Date 11/01/2022 [Member] | | | |
Debt Instrument [Line Items] | | | |
Effective fixed rate, percent | 2.64% | | |
Term loan, amount | $ 400,000,000 | | |
Subsequent Event [Member] | LIBOR [Member] | Term Loan With Maturity Date 11/01/2022 [Member] | | | |
Debt Instrument [Line Items] | | | |
Basis spread | 1.35% | | |