CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 67,581 $ 57,993
Adjustments to net income:    
Depreciation and amortization 98,037 89,970
Income from discontinued operations   (3,077)
Amortization of share-based compensation 2,552 2,697
Non-cash rental adjustments (2,449) (1,942)
Amortization of net premiums on mortgages payable (1,962) (2,385)
Amortization of deferred financing costs 2,228 2,585
Gain on sale of real estate (7,218) (1,271)
Provisions for impairment on real estate 2,087 1,683
Cash provided by discontinued operations   1,290
Change in assets and liabilities    
Accounts receivable and other assets 892 9,600
Accounts payable, accrued expenses and other liabilities (43,896) (42,947)
Net cash provided by operating activities 117,852 114,196
CASH FLOWS FROM INVESTING ACTIVITIES    
Investment in real estate (202,781) (603,980)
Improvements to real estate, including leasing costs (1,345) (1,369)
Proceeds from sales of real estate:    
Continuing operations 22,274 5,772
Discontinued operations   6,918
Restricted escrow deposits for Section 1031 tax-deferred exchanges and pending acquisitions 18,083 (460)
Net cash used in investing activities (163,769) (593,119)
CASH FLOWS FROM FINANCING ACTIVITIES    
Cash distributions to common stockholders (126,682) (113,414)
Cash dividends to preferred stockholders (6,770) (10,482)
Borrowings on line of credit 282,000 732,800
Payments on line of credit (135,000) (120,700)
Principal payments on mortgages payable (51,296) (1,797)
Redemption of preferred units (6,750)  
Distributions to noncontrolling interests (428) (466)
Proceeds from dividend reinvestment and stock purchase plan, net 102,162 2,126
Other items, including shares withheld upon vesting (2,981) (5,259)
Net cash provided by financing activities 54,255 482,808
Net increase in cash and cash equivalents 8,338 3,885
Cash and cash equivalents, beginning of period 3,852 10,257
Cash and cash equivalents, end of period $ 12,190 $ 14,142