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Summary of Significant Accounting Policies Receivables, Trade and Other Accounts Receivalbe, Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Provision for Doubtful Accounts | $ 10,100 | $ 8,040 |
Straight Line Rent | 105,677 | 93,284 |
Tenant Reimbursements (Deprecated 2018-01-31) | 25,305 | 14,825 |
Billed Tenant Receivables [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts and Notes Receivable, Net | 25,590 | 25,329 |
Other Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts and Notes Receivable, Net | 30,953 | 34,472 |
Notes Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts and Notes Receivable, Net | 0 | 15,803 |
straight line rent [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for Doubtful Accounts | 5,066 | 4,688 |
Parent Company [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Land | 4,205,445 | 4,235,032 |
Property Management Fee Revenue | 28,494 | 26,158 | $ 25,327
Accounts and Notes Receivable, Net | 172,359 | 170,985 |
Land Improvements | 613,847 | 556,140 |
Buildings | 5,088,102 | 4,999,378 |
Building improvements | 901,596 | 787,880 |
Development in Process | 54,172 | 314,391 |
Real Estate Investment Property, at Cost | 10,863,162 | 10,892,821 |
Asset management services [Member] | Parent Company [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Property Management Fee Revenue | 7,213 | 7,090 | 6,746
Leasing services [Member] | Parent Company [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Property Management Fee Revenue | 4,044 | 3,573 | 4,285
Other transaction fees [Member] | Parent Company [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Property Management Fee Revenue | 2,574 | 1,578 | 1,221
Property management services [Member] | Parent Company [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Property Management Fee Revenue | $ 14,663 | $ 13,917 | $ 13,075

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