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Condensed Consolidated Statement of Equity - USD ($) $ 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]
--- | --- | --- | --- | --- | --- | ---
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 |  | 66,054,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 289,159 |  |  | 272,333 |  | 16,826
Reversal of unrealized gains 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 |  | 2,751 |  |  |
Stock option and restricted stock plans, net (in shares) |  | 17,000 |  |  |  |
Sale of common stock, net | (483) |  | (483) |  |  |
Equity based compensation costs | 8,561 |  | 7,697 |  |  | 864
Retirement of common stock, net | (3,774) |  | (3,774) |  |  |
Retirement of common stock, net (in shares) |  | (17,000) |  |  |  |
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) |  | 1,000 |  |  |  |
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 |  | 66,055,000 |  |  |  |
Balance at period beginning at Jun. 30, 2018 | 6,474,683 | $ 7 | 7,131,809 | (766,193) | (11,438) | 120,498
Balances (in shares) at Jun. 30, 2018 |  | 66,050,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 86,110 |  |  | 80,975 |  | 5,135
Reversal of unrealized gains upon the sale of marketable debt securities | 4 |  |  |  | 4 |
Change in fair value of derivatives and amortization of swap settlements | 2,974 |  |  |  | 2,875 | 99
Change in fair value of marketable debt securities, net | 12 |  |  |  | 11 | 1
Issuance of common stock under: |  |  |  |  |  |
Stock option and restricted stock plans, net | 887 |  | 887 |  |  |
Stock option and restricted stock plans, net (in shares) |  | 5,000 |  |  |  |
Sale of common stock, net | (130) |  | (130) |  |  |
Equity based compensation costs | 1,747 |  | 1,496 |  |  | 251
Changes in the redemption value of redeemable noncontrolling interest | (408) |  | (386) |  |  | (22)
Distributions to noncontrolling interest | (6,884) |  |  |  |  | (6,884)
Redemptions of noncontrolling interest | (100) |  | (89) |  |  | (11)
Common stock dividends | (122,867) |  |  | (122,867) |  |
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 |  | 66,055,000 |  |  |  |
Issuance of common stock under: |  |  |  |  |  |
Cumulative effect upon adoption of ASU No. 2017-12 |  |  |  |  | 175 |
Balance at period beginning at Dec. 31, 2018 | 6,393,844 | $ 7 | 7,093,079 | (812,796) | (13,217) | 126,771
Balances (in shares) at Dec. 31, 2018 |  | 65,890,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 329,266 |  |  | 310,468 |  | 18,798
Reversal of unrealized gains upon the sale of marketable debt securities | (32) |  |  |  | (31) | (1)
Change in fair value of derivatives and amortization of swap settlements | (6,366) |  |  |  | (6,152) | (214)
Change in fair value of marketable debt securities, net | 203 |  |  |  | 197 | 6
Issuance of common stock under: |  |  |  |  |  |
Stock option and restricted stock plans, net | 32,907 |  | 32,907 |  |  |
Stock option and restricted stock plans, net (in shares) |  | 188,000 |  |  |  |
Sale of common stock, net | 72,549 | $ 73,400 | 72,549 |  |  |
Sale of common stock, net (in shares) |  | 228,271 |  |  |  |
Equity based compensation costs | 7,914 |  | 7,016 |  |  | 898
Retirement of common stock, net | (56,989) |  | (56,989) |  |  |
Retirement of common stock, net (in shares) |  | (234,000) |  |  |  |
Changes in the redemption value of redeemable noncontrolling interest | (3,675) |  | (5,048) |  |  | 1,373
Changes in noncontrolling interest from acquisition | 65,472 |  |  |  |  | 65,472
Distributions to noncontrolling interest | (20,897) |  |  |  |  | (20,897)
Redemptions of noncontrolling interest | (14,180) |  | (11,872) |  |  | (2,308)
Redemptions of noncontrolling interest (in shares) |  | 10,000 |  |  |  |
Common stock dividends | (385,193) |  |  | (385,193) |  |
Balance at period end at Sep. 30, 2019 | 6,415,004 | $ 7 | 7,131,642 | (887,521) | (19,028) | 189,904
Balances (in shares) at Sep. 30, 2019 |  | 66,082,000 |  |  |  |
Balance at period beginning at Jun. 30, 2019 | 6,345,116 | $ 7 | 7,031,886 | (857,994) | (18,992) | 190,209
Balances (in shares) at Jun. 30, 2019 |  | 65,727,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 105,700 |  |  | 99,335 |  | 6,365
Change in fair value of derivatives and amortization of swap settlements | (12) |  |  |  | (12) | 0
Change in fair value of marketable debt securities, net | (25) |  |  |  | (24) | (1)
Issuance of common stock under: |  |  |  |  |  |
Stock option and restricted stock plans, net | 27,679 |  | 27,679 |  |  |
Stock option and restricted stock plans, net (in shares) |  | 126,000 |  |  |  |
Sale of common stock, net | 72,631 |  | 72,631 |  |  |
Sale of common stock, net (in shares) |  | 228,000 |  |  |  |
Equity based compensation costs | 1,814 |  | 1,544 |  |  | 270
Changes in the redemption value of redeemable noncontrolling interest | (2,247) |  | (2,309) |  |  | 62
Distributions to noncontrolling interest | (6,789) |  |  |  |  | (6,789)
Redemptions of noncontrolling interest | (1) |  | 211 |  |  | (212)
Redemptions of noncontrolling interest (in shares) |  | 1,000 |  |  |  |
Common stock dividends | (128,862) |  |  | (128,862) |  |
Balance at period end at Sep. 30, 2019 | $ 6,415,004 | $ 7 | $ 7,131,642 | $ (887,521) | $ (19,028) | $ 189,904
Balances (in shares) at Sep. 30, 2019 |  | 66,082,000 |  |  |  |

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