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Debt, Net (Details 2) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Carrying amount and estimated fair value of debt |  |
Carrying Value | $ 2,140,212 | $ 2,077,752
Carrying Amount |  |
Carrying amount and estimated fair value of debt |  |
Variable-rate debt | 672,693 | 609,194
Carrying Value | 2,140,212 | 2,077,752
Carrying Amount | Unsecured senior notes |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 1,186,255 | 1,185,842
Carrying Amount | Other fixed-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 281,264 | 282,716
Total Estimated Fair Value |  |
Carrying amount and estimated fair value of debt |  |
Variable-rate debt | 677,203 | 610,987
Carrying Value | 2,182,752 | 2,114,636
Total Estimated Fair Value | Unsecured senior notes |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | 1,216,295 | 1,211,658
Total Estimated Fair Value | Other fixed-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Fixed-rate debt | $ 289,254 | $ 291,991

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