Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	$ 2,023	$ 16,687
Derivative liabilities	1,294	0
Unsecured Debt \| 3.95% Registered Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Amortization of discount	2,700	600
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-real estate investments	142,761	146,880
Carrying Value \| Unsecured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	2,487,709	2,274,352
Carrying Value \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	365,099	365,381
Carrying Value \| In-substance Defeased Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	136,636	138,223
Carrying Value \| Joint Venture Partner Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	66,136	66,136
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-real estate investments	146,664	147,686
Fair Value \| Unsecured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	2,527,147	2,227,265
Fair Value \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	360,795	354,109
Fair Value \| In-substance Defeased Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	136,532	135,894
Fair Value \| Joint Venture Partner Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt	68,654	66,136
Non-Real Estate Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-real estate investments	4,637	2,713
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	0	0
Derivative liabilities	0	0
Level 1 \| Non-Real Estate Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-real estate investments	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	2,023	16,687
Derivative liabilities	1,294	0
Level 2 \| Non-Real Estate Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-real estate investments	4,637	2,713
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	0	0
Derivative liabilities	0	0
Level 3 \| Non-Real Estate Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Non-real estate investments	$ 0	$ 0

Amount, after accumulated amortization, of debt discount.

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