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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 | 96,639 |  |  | 90,918 |  | 5,721
Reversal of unrealized gains upon the sale of marketable debt securities | (1) |  |  |  | (1) | 0
Change in fair value of derivatives and amortization of swap settlements | 6,254 |  |  |  | 6,046 | 208
Change in fair value of marketable debt securities, net | (77) |  |  |  | (74) | (3)
Issuance of common stock under: |  |  |  |  |  |
Stock option and restricted stock plans, net | 1,222 |  | 1,222 |  |  |
Stock option and restricted stock plans, net (in shares) |  | 7 |  |  |  |
Sale of common stock, net | (67) |  | (67) |  |  |
Sale of common stock, net (in shares) |  | 0 |  |  |  |
Equity based compensation costs | 2,530 |  | 2,253 |  |  | 277
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 | (1,953) |  | (1,957) |  |  | 4
Distributions to noncontrolling interest | (6,297) |  |  |  |  | (6,297)
Common stock dividends | (122,850) |  |  | (122,850) |  |
Balance at period end at Mar. 31, 2018 | $ 6,492,159 | $ 7 | $ 7,127,248 | $ (743,773) | $ (14,709) | $ 123,386
Balances (in shares) at Mar. 31, 2018 |  | 66,044 |  |  |  |

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