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Debt (Details 3) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt, net | $ 2,077,752 | $ 1,914,036
Unsecured Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt, net | 1,200,000 |
Carrying Amount [Member] |  |
Debt Instrument [Line Items] |  |
Variable-rate debt | 609,194 | 637,544
Debt, net | 2,077,752 | 1,914,036
Carrying Amount [Member] | Unsecured Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Fixed-rate debt | 1,185,842 | 888,544
Carrying Amount [Member] | Other Fixed-Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Fixed-rate debt | 282,716 | 387,948
Estimated Fair Value [Member] |  |
Debt Instrument [Line Items] |  |
Variable-rate debt | 610,987 | 642,091
Debt, net | 2,114,636 | 1,900,067
Estimated Fair Value [Member] | Unsecured Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Fixed-rate debt | 1,211,658 | 901,599
Estimated Fair Value [Member] | Other Fixed-Rate Debt [Member] |  |
Debt Instrument [Line Items] |  |
Fixed-rate debt | $ 291,991 | $ 356,377

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