Intangibles - Estimated Aggregate Amortization of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Estimated aggregate amortization of Intangible Assets
Estimated aggregate amortization of intangible assets, 2017	$ 86,113
Estimated aggregate amortization of intangible assets, 2018	69,805
Estimated aggregate amortization of intangible assets, 2019	51,710
Estimated aggregate amortization of intangible assets, 2020	43,763
Estimated aggregate amortization of intangible assets, 2021	37,255
Estimated aggregate amortization of intangible assets, thereafter	191,159
Net intangible lease assets	479,805	$ 586,657
Estimate aggregate amortization of Intangible Liabilities
Estimated aggregate amortization of intangible liabilities, 2017	11,686
Estimated aggregate amortization of intangible liabilities, 2018	9,018
Estimated aggregate amortization of intangible liabilities, 2019	6,558
Estimated aggregate amortization of intangible liabilities, 2020	5,142
Estimated aggregate amortization of intangible liabilities, 2021	3,636
Estimated aggregate amortization of intangible liabilities, thereafter	22,105
Net intangible lease liabilities	$ 58,145	$ 56,147