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Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands | Total | Series H Preferred Stock [Member] | Common Stock [Member] | Additional paid-in capital [Member] | Distributions in excess of accumulated earnings [Member] | Accumulated other comprehensive loss, net [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2015 | $ 6,337,023 | $ 73,750 | $ 6 | $ 7,003,317 | $ (797,329) | $ (42,011) | $ 99,290
Balances (in shares) at Dec. 31, 2015 |  | 2,950 | 65,379 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 438,410 |  |  |  | 414,979 |  | 23,431
Reversal of unrealized gains upon the sale of marketable securities | (4,848) |  |  |  |  | (4,689) | (159)
Change in fair value of derivatives and amortization of swap settlements | 15,926 |  |  |  |  | 15,403 | 523
Change in fair value of marketable securities, net | (828) |  |  |  |  | (801) | (27)
Issuance of common stock under: |  |  |  |  |  |  |
Stock option and restricted stock plans, net | 18,949 |  |  | 18,949 |  |  |
Stock option and restricted stock plans, net (in shares) |  |  | 140 |  |  |  |
Sale of common stock, net | (384) |  |  | (384) |  |  |
Equity based compensation costs | 10,899 |  |  | 8,246 |  |  | 2,653
Redemption of Series H preferred stock | (73,750) | $ (73,750) |  | 2,541 | (2,541) |  |
Redemption of Series H preferred stock (in shares) |  | (2,950) |  |  |  |  |
Retirement of common stock, net | (1,045) |  |  | (1,045) |  |  |
Retirement of common stock, net (in shares) |  |  | (5) |  |  |  |
Changes in the redemption value of redeemable noncontrolling interest | 768 |  |  | 172 |  |  | 596
Distributions to noncontrolling interest | (25,854) |  |  |  |  |  | (25,854)
Redemptions of noncontrolling interest | (2,511) |  |  | (2,117) |  |  | (394)
Redemptions of noncontrolling interest (in shares) |  |  | 14 |  |  |  |
Preferred stock dividends ($0.45 per share) | (1,314) |  |  |  | (1,314) |  |
Common stock dividends ($6.40 per share) | (419,204) |  |  |  | (419,204) |  |
Balances at Dec. 31, 2016 | 6,292,237 | $ 0 | $ 6 | 7,029,679 | (805,409) | (32,098) | 100,059
Balances (in shares) at Dec. 31, 2016 |  | 0 | 65,528 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 458,043 |  |  |  | 433,059 |  | 24,984
Reversal of unrealized gains upon the sale of marketable securities | (1,909) |  |  |  |  | (1,846) | (63)
Change in fair value of derivatives and amortization of swap settlements | 12,744 |  |  |  |  | 12,322 | 422
Change in fair value of marketable securities, net | 3,284 |  |  |  |  | 3,176 | 108
Issuance of common stock under: |  |  |  |  |  |  |
Stock option and restricted stock plans, net | 26,635 |  |  | 26,635 |  |  |
Stock option and restricted stock plans, net (in shares) |  |  | 179 |  |  |  |
Sale of common stock, net | 89,055 |  | $ 1 | 89,054 |  |  |
Sale of common stock, net (in shares) |  |  | 345 |  |  |  |
Equity based compensation costs | 11,302 |  |  | 9,529 |  |  | 1,773
Changes in the redemption value of redeemable noncontrolling interest | (65) |  |  | (136) |  |  | 71
Changes in noncontrolling interest from acquisition | 22,506 |  |  |  |  |  | 22,506
Distributions to noncontrolling interest | (27,051) |  |  |  |  |  | (27,051)
Redemptions of noncontrolling interest | (28,580) |  |  | (25,190) |  |  | (3,390)
Redemptions of noncontrolling interest (in shares) |  |  | 2 |  |  |  |
Common stock dividends ($6.40 per share) | (461,376) |  |  |  | (461,376) |  |
Balances at Dec. 31, 2017 | 6,396,825 | $ 0 | $ 7 | 7,129,571 | (833,726) | (18,446) | 119,419
Balances (in shares) at Dec. 31, 2017 |  | 0 | 66,054 |  |  |  |
Issuance of common stock under: |  |  |  |  |  |  |
Cumulative adjustment to retained earnings |  |  |  |  |  | (2,234) |
Cumulative adjustment to retained earnings | ASU 2016-01 [Member] |  |  |  |  | 2,234 | (2,234) |
Cumulative adjustment to retained earnings | ASU 2017-05 [Member] | 123,708 |  |  |  | 119,651 |  | 4,057
Net income | 413,599 |  |  |  | 390,153 |  | 23,446
Reversal of unrealized gains upon the sale of marketable securities | 13 |  |  |  |  | 13 | 0
Change in fair value of derivatives and amortization of swap settlements | 7,824 |  |  |  |  | 7,564 | 260
Change in fair value of marketable securities, net | (118) |  |  |  |  | (114) | (4)
Stock option and restricted stock plans, net | 6,213 |  |  | 6,213 |  |  |
Stock option and restricted stock plans, net (in shares) |  |  | 41 |  |  |  |
Sale of common stock, net | (919) |  |  | (919) |  |  |
Equity based compensation costs | 12,851 |  |  | 11,651 |  |  | 1,200
Retirement of common stock, net | (51,233) |  |  | (51,233) |  |  |
Retirement of common stock, net (in shares) |  |  | (210) |  |  |  |
Changes in the redemption value of redeemable noncontrolling interest | (1,164) |  |  | (1,143) |  |  | (21)
Changes in noncontrolling interest from acquisition | 7,919 |  |  |  |  |  | 7,919
Distributions to noncontrolling interest | (29,233) |  |  |  |  |  | (29,233)
Redemptions of noncontrolling interest | (1,333) |  |  | (1,061) |  |  | (272)
Redemptions of noncontrolling interest (in shares) |  |  | 5 |  |  |  |
Common stock dividends ($6.40 per share) | (491,108) |  |  |  | (491,108) |  |
Balances at Dec. 31, 2018 | $ 6,393,844 | $ 0 | $ 7 | $ 7,093,079 | $ (812,796) | $ (13,217) | $ 126,771
Balances (in shares) at Dec. 31, 2018 |  | 0 | 65,890 |  |  |  |

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