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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 319,318 $ 316,477 $ 284,855
Adjustments to net income:      
Depreciation and amortization 498,788 449,943 409,215
Loss on extinguishment of debt 42,426    
Amortization of share-based compensation 13,946 12,007 10,391
Non-cash revenue adjustments (3,927) (10,154) (8,607)
Amortization of net premiums on mortgages payable (466) (3,414) (7,482)
Amortization of deferred financing costs 9,158 8,904 9,044
(Gain) loss on interest rate swaps (3,250) (1,639) 3,043
Gain on sales of real estate (40,898) (21,979) (22,243)
Provisions for impairment on real estate 14,751 20,664 10,560
Change in assets and liabilities      
Accounts receivable and other assets (92) (5,414) (1,377)
Accounts payable, accrued expenses and other liabilities 26,096 34,468 6,168
Net cash provided by operating activities 875,850 799,863 693,567
CASH FLOWS FROM INVESTING ACTIVITIES      
Investment in real estate (1,413,270) (1,798,892) (1,266,885)
Improvements to real estate, including leasing costs (15,247) (13,426) (11,541)
Proceeds from sales of real estate 166,976 99,096 65,817
Insurance proceeds received 14,411    
Collection of loans receivable 123 12,515  
Non-refundable escrow deposits for pending acquisitions (7,500)    
Net cash used in investing activities (1,254,507) (1,700,707) (1,212,609)
CASH FLOWS FROM FINANCING ACTIVITIES      
Cash distributions to common stockholders (689,294) (610,516) (533,238)
Cash dividends to preferred stockholders (6,168) (27,080) (27,080)
Borrowings on line of credit 1,465,000 3,879,000 1,448,000
Payments on line of credit (2,475,000) (2,997,000) (1,433,000)
Proceeds from notes and bonds payable issued 2,033,041 592,026  
Principal payment on notes payable (725,000) (275,000) (150,000)
Proceeds from mortgages payable   9,963  
Payments upon extinguishment of debt (41,643)    
Principal payments on mortgages payable (139,725) (231,743) (198,353)
Proceeds from term loans     250,000
Redemption of preferred stock (408,750)    
Proceeds from common stock offerings, net 704,938 383,572 793,559
Proceeds from dividend reinvestment and stock purchase plan 69,931 10,252 363,029
Procceds from At-the-Market (ATM) program 621,697 166,781 36,348
Redemption of preferred units     (6,750)
Redemption of common units   (9,026)  
Distributions to noncontrolling interests (2,043) (12,725) (1,679)
Debt issuance costs (17,510) (5,274) (10,259)
Other items, including shares withheld upon vesting (14,356) (7,038) (7,383)
Net cash provided by financing activities 375,118 866,192 523,194
Net (decrease) increase in cash, cash equivalents and restricted cash (3,539) (34,652) 4,152
Cash, cash equivalents and restricted cash, beginning of period 15,681 50,333 46,181
Cash, cash equivalents and restricted cash, end of period $ 12,142 $ 15,681 $ 50,333