Marketable Securities and Derivative Instruments (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
---|---|---|
Schedule of Available-for-sale Securities [Line Items] | ||
Available-for-sale Securities, Equity Securities | $ 150,997 | $ 206,323 |
Available-for-sale Equity Securities, Amortized Cost Basis | 72,549 | 72,549 |
Available-for-sale Securities, Gross Unrealized Gain | 78,448 | 133,774 |
Lexington Realty Trust [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Available-for-sale Securities, Equity Securities | 147,752 | 202,789 |
Available-for-sale Equity Securities, Amortized Cost Basis | 72,549 | 72,549 |
Available-for-sale Securities, Gross Unrealized Gain | 75,203 | 130,240 |
Other Equity Securities [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Available-for-sale Securities, Equity Securities | 3,245 | 3,534 |
Available-for-sale Equity Securities, Amortized Cost Basis | 0 | 0 |
Available-for-sale Securities, Gross Unrealized Gain | $ 3,245 | $ 3,534 |