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Condensed Consolidated Statement of Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Distributions in Excess of Accumulated Earnings [Member] | Accumulated Other Comprehensive Loss, Net [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | ---
Issuance of common stock under: |  |  |  |  |  |
Cumulative effect upon adoption |  |  |  |  | $ (2,234) |
Cumulative effect upon adoption | ASU 2016-01 [Member] | $ 0 |  |  | $ 2,234 | (2,234) |
Cumulative effect upon adoption | ASU 2017-05 [Member] | 123,708 |  |  | 119,651 |  | $ 4,057
Balance at period beginning at Dec. 31, 2017 | 6,396,825 | $ 7 | $ 7,129,571 | (833,726) | (18,446) | 119,419
Balances (in shares) at Dec. 31, 2017 |  | 66,054 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 289,159 |  |  | 272,333 |  | 16,826
Reversal of unrealized losses upon the sale of marketable debt securities | 6 |  |  |  | 6 |
Change in fair value of derivatives and amortization of swap settlements | 12,630 |  |  |  | 12,210 | 420
Change in fair value of marketable debt securities, net | (87) |  |  |  | (84) | (3)
Issuance of common stock under: |  |  |  |  |  |
Stock option and restricted stock plans, net | 2,751 | $ 0 | 2,751 |  |  |
Stock option and restricted stock plans, net (in shares) |  | 17 |  |  |  |
Sale of common stock, net | (483) |  | (483) |  |  |
Equity based compensation costs | 8,561 |  | 7,697 |  |  | 864
Retirement of common stock, net | (3,774) | $ 0 | (3,774) |  |  |
Retirement of common stock, net (in shares) |  | (17) |  |  |  |
Changes in the redemption value of redeemable noncontrolling interest | (2,253) |  | (2,032) |  |  | (221)
Distributions to noncontrolling interest | (22,281) |  |  |  |  | (22,281)
Redemptions of noncontrolling interest | (157) |  | (143) |  |  | (14)
Redemptions of noncontrolling interest (in shares) |  | 1 |  |  |  |
Common stock dividends | (368,577) |  |  | (368,577) |  |
Balance at period end at Sep. 30, 2018 | $ 6,436,028 | $ 7 | $ 7,133,587 | $ (808,085) | $ (8,548) | $ 119,067
Balances (in shares) at Sep. 30, 2018 |  | 66,055 |  |  |  |

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