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Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | $ 183,872 | $ 169,224
Intangible Assets, Accumulated Amortization | (72,249) | (69,821)
Intangible Assets, net | 111,623 | 99,403
Acquired Lease Intangibles, Gross | 48,956 | 53,049
Acquired Lease Intangibles, Accumulated Amortization | (23,301) | (27,039)
Acquired Lease Intangibles, Net | 25,655 | 26,010
Below market leases [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross | 50,025 |
Acquired Lease Intangibles, Accumulated Amortization | (24,178) |
Acquired Lease Intangibles, Net | 25,847 |
Liabilities of assets held for sale [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross | 1,069 |
Acquired Lease Intangibles, Accumulated Amortization | (877) |
Acquired Lease Intangibles, Net | 192 |
In-place lease value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 161,276 | 129,411
Intangible Assets, Accumulated Amortization | (57,063) | (42,068)
Intangible Assets, net | 104,213 | 87,343
Tenant relationship value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 20,117 | 34,172
Intangible Assets, Accumulated Amortization | (15,580) | (26,344)
Intangible Assets, net | 4,537 | 7,828
Above market leases acquired [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 5,333 | 5,641
Intangible Assets, Accumulated Amortization | (1,879) | (1,409)
Intangible Assets, net | 3,454 | $ 4,232
Intangible assets including assets held for sale [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 186,726 |
Intangible Assets, Accumulated Amortization | (74,522) |
Intangible Assets, net | 112,204 |
Assets held for sale [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 2,854 |
Intangible Assets, Accumulated Amortization | (2,273) |
Intangible Assets, net | $ 581 |

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