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Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Series H Preferred Stock [Member] | Series I Preferred Stock [Member] | Series J Preferred Stock [Member] | Series K Preferred Stock [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Parent [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 |  |  |  |  |  |  |  |  | $ (824,008) | $ (66,182) | $ 102 | $ 4,078 | $ 5,651,170 | $ 4,765,160 | $ 167,320 | $ 4,932,480
Balance (in Shares) at Dec. 31, 2012 |  |  |  |  |  |  |  |  |  |  | 102,000 | 407,782,000 |  |  |  |
Contributions from noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,026 | 1,026
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 236,281 |  |  |  |  | 236,281 | 5,072 | 241,353
Other comprehensive income, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized gain on marketable securities |  |  |  |  |  |  |  |  |  | 6,773 |  |  |  | 6,773 |  | 6,773
Change in foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (5,573) |  |  |  | (5,573) | 1,365 | (4,208)
Redeemable noncontrolling interests income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,892) | (6,892)
Class J Depositary Share, and $1.40625 per |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  | (408,331) |  |  |  |  | (408,331) |  | (408,331)
Distributions to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10,686) | (10,686)
Issuance of stock |  |  |  |  |  |  |  |  |  |  |  | $ 5 | 9,208 | 9,213 |  | 9,213
Issuance of stock (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 560,000 |  |  |  |
Surrender of common stock |  |  |  |  |  |  |  |  |  |  |  | $ (2) | (3,889) | (3,891) |  | (3,891)
Surrender of common stock (in Shares) |  |  |  |  |  |  |  |  |  |  |  | (247,000) |  |  |  |
Exercise of common stock options |  |  |  |  |  |  |  |  |  |  |  | $ 16 | 30,193 | 30,209 |  | $ 30,209
Exercise of common stock options (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 1,636,000 |  |  |  | 1,636,300
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | (8,894) | (8,894) | (20,096) | $ (28,990)
Amortization of equity awards |  |  |  |  |  |  |  |  |  |  |  |  | 11,470 | 11,470 |  | 11,470
Balance at Dec. 31, 2013 |  |  |  |  |  |  |  |  | (996,058) | (64,982) | $ 102 | $ 4,097 | 5,689,258 | 4,632,417 | 137,109 | 4,769,526
Balance (in Shares) at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  | 102,000 | 409,731,000 |  |  |  |
Contributions from noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,259 | 6,259
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 424,001 |  |  |  |  | 424,001 | 11,879 | 435,880
Other comprehensive income, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized gain on marketable securities |  |  |  |  |  |  |  |  |  | 20,202 |  |  |  | 20,202 |  | 20,202
Change in unrealized gain on interest rate swaps |  |  |  |  |  |  |  |  |  | (1,404) |  |  |  | (1,404) |  | (1,404)
Change in foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 91,306 |  |  |  | 91,306 | 5,589 | 96,895
Redeemable noncontrolling interests income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,335) | (6,335)
Class J Depositary Share, and $1.40625 per |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  | (434,521) |  |  |  |  | (434,521) |  | (434,521)
Distributions to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (26,755) | (26,755)
Issuance of stock | $ 169,200 | [1] | $ 387,200 | [2] | $ 217,800 | [3] | $ 169,100 | [3] |  |  |  | $ 8 | 14,039 | 14,047 |  | 14,047
Issuance of stock (in Shares) | 7,000,000 | [1] | 16,000,000 | [2] | 9,000,000 | [3] | 7,000,000 | [3] |  |  |  | 805,000 |  |  |  |
Surrender of common stock |  |  |  |  |  |  |  |  |  |  |  | $ (2) | (4,049) | (4,051) |  | (4,051)
Surrender of common stock (in Shares) |  |  |  |  |  |  |  |  |  |  |  | (190,000) |  |  |  |
Exercise of common stock options |  |  |  |  |  |  |  |  |  |  |  | $ 15 | 23,859 | 23,874 |  | $ 23,874
Exercise of common stock options (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 1,474,000 |  |  |  | 1,474,432
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | (294) | (294) | (766) | $ (1,060)
Amortization of equity awards |  |  |  |  |  |  |  |  |  |  |  |  | 9,208 | 9,208 |  | 9,208
Balance at Dec. 31, 2014 |  |  |  |  |  |  |  |  | (1,006,578) | 45,122 | $ 102 | $ 4,118 | 5,732,021 | 4,774,785 | 126,980 | 4,901,765
Balance (in Shares) at Dec. 31, 2014 | 70,000 |  | 16,000 |  | 9,000 |  | 7,000 |  |  |  | 102,000 | 411,820,000 |  |  |  |
Contributions from noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,163 | 66,163
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 894,115 |  |  |  |  | 894,115 | 6,028 | 900,143
Other comprehensive income, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unrealized gain on marketable securities |  |  |  |  |  |  |  |  |  | (45,799) |  |  |  | (45,799) |  | (45,799)
Change in unrealized gain on interest rate swaps |  |  |  |  |  |  |  |  |  | (22) |  |  |  | (22) |  | (22)
Change in foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 6,287 |  |  |  | 6,287 |  | 6,287
Redeemable noncontrolling interests income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,061) | (7,061)
Class J Depositary Share, and $1.40625 per |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  | (459,872) |  |  |  |  | (459,872) |  | (459,872)
Distributions to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,539) | (8,539)
Issuance of stock |  |  | $ 387,200 | [2] | $ 217,800 | [3] | $ 169,100 | [3] |  |  |  | $ 8 | 485 | 493 |  | 493
Issuance of stock (in Shares) |  |  | 16,000,000 | [2] | 9,000,000 | [3] | 7,000,000 | [3] |  |  |  | 824,000 |  |  |  |
Surrender of common stock |  |  |  |  |  |  |  |  |  |  |  | $ (2) | (5,680) | (5,682) |  | (5,682)
Surrender of common stock (in Shares) |  |  |  |  |  |  |  |  |  |  |  | (232,000) |  |  |  |
Exercise of common stock options |  |  |  |  |  |  |  |  |  |  |  | $ 10 | 18,698 | 18,708 |  | $ 18,708
Exercise of common stock options (in Shares) |  |  |  |  |  |  |  |  |  |  |  | 1,019,000 |  |  |  | 1,019,240
Sale of interests in investments, net of tax of $16.0 million |  |  |  |  |  |  |  |  |  |  |  |  | 23,993 | 23,993 |  | $ 23,993
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 262 | 262 | (47,920) | (47,658)
Amortization of equity awards |  |  |  |  |  |  |  |  |  |  |  |  | 14,032 | 14,032 |  | 14,032
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  | $ (70) |  | (174,930) | (175,000) |  | (175,000)
Redemption of preferred stock (in Shares) | (7,000,000) |  |  |  |  |  |  |  |  |  | (70,000) |  |  |  |  |
Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  | $ (572,335) | $ 5,588 | $ 32 | $ 4,134 | $ 5,608,881 | $ 5,046,300 | $ 135,651 | $ 5,181,951
Balance (in Shares) at Dec. 31, 2015 |  |  | 16,000 |  | 9,000 |  | 7,000 |  |  |  | 32,000 | 413,431,000 |  |  |  |
[1] | The net proceeds received from this offering were used for general corporate purposes, including the reduction of borrowings outstanding under the Company's revolving credit facility and the redemption of shares of the Company's preferred stock.
[2] | The net proceeds received from this offering were used for the redemption of all the outstanding depositary shares representing the Company's Class F preferred stock, which redemption occurred on August 15, 2012 with the remaining proceeds used towards the redemption of outstanding depositary shares representing the Company's Class G preferred stock, which redemption occurred on October 10, 2012 and general corporate purposes.
[3] | The net proceeds received from this offering were used for general corporate purposes, including funding towards the repayment of maturing Senior Unsecured Notes.

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