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Equity | 3 Months Ended
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Mar. 31, 2017
Stockholders' Equity Note [Abstract] |
Equity | Equity The following summarizes the changes in equity for the three months ended March 31, 2017 (dollars in thousands):
| Common stock |  | Additional paid-in capital |  | Accumulated earnings less dividends |  | Accumulated other comprehensive loss |  | Total equity
Balance at December 31, 2016 | $ | 1,373 |  |  | $ | 10,105,654 |  |  | $ | 94,899 |  |  | $ | (30,510 | ) |  | $ | 10,171,416 |
Net income attributable to common stockholders | — |  |  | — |  |  | 235,875 |  |  | — |  |  | 235,875 |
Gain on cash flow hedges, net | — |  |  | — |  |  | — |  |  | 145 |  |  | 145 |
Cash flow hedge loss reclassified to earnings | — |  |  | — |  |  | — |  |  | 1,752 |  |  | 1,752 |
Change in redemption value of redeemable noncontrolling interest | — |  |  | — |  |  | (183 | ) |  | — |  |  | (183 | )
Dividends declared to common stockholders | — |  |  | — |  |  | (195,657 | ) |  | — |  |  | (195,657 | )
Issuance of common stock, net of withholdings | 5 |  |  | 47,962 |  |  | (1,260 | ) |  | — |  |  | 46,707 |
Amortization of deferred compensation | — |  |  | 6,567 |  |  | — |  |  | — |  |  | 6,567 |
Balance at March 31, 2017 | $ | 1,378 |  |  | $ | 10,160,183 |  |  | $ | 133,674 |  |  | $ | (28,613 | ) |  | $ | 10,266,622 |
As of March 31, 2017 and December 31, 2016, the Company's charter authorized a total of 280,000,000 shares of common stock and 50,000,000 shares of preferred stock for issuance. During the three months ended March 31, 2017, the Company:
i. | issued 7,266 shares of common stock in connection with stock options exercised;
ii. | issued 1,165 common shares through the Company's dividend reinvestment plan;
iii. | issued 198,502 common shares in connection with restricted stock grants and the conversion of performance awards to restricted shares;
iv. | issued 306,177 shares under CEP IV as discussed below;
v. | withheld 57,172 common shares to satisfy employees' tax withholding and other liabilities; and
vi. | canceled 236 common shares of restricted stock upon forfeiture.
Any deferred compensation related to the Company's stock option, restricted stock and performance award grants during the three months ended March 31, 2017 is not reflected on the accompanying Condensed Consolidated Balance Sheet as of March 31, 2017, and will not be reflected until recognized as compensation cost. In December 2015, the Company commenced a fourth continuous equity program ("CEP IV") under which the Company may sell up to $1,000,000,000 of its common stock from time to time. Actual sales will depend on a variety of factors to be determined by the Company, including market conditions, the trading price of the Company's common stock and determinations by the Company of the appropriate sources of funding for the Company. In conjunction with CEP IV, the Company engaged sales agents who will receive compensation of up to 2.0% of the gross sales price for shares sold. CEP IV also allows the Company to enter into forward sale agreements up to $1,000,000,000 in aggregate sales price of its common stock. The Company expects that it will physically settle each forward sale agreement on one or more dates specified by the Company on or prior to the maturity date of that particular forward sale agreement, in which case the Company will expect to receive aggregate net cash proceeds at settlement equal to the number of shares underlying the particular forward agreement multiplied by the relevant forward sale price. However, the Company may also elect to cash settle or net share settle a forward sale agreement. In connection with each forward sale agreement, the Company will pay the relevant forward seller, in the form of a reduced initial forward sale price, a commission of up to 2.0% of the sales prices of all borrowed shares of common stock sold. During the three months ended March 31, 2017, the Company sold 306,177 shares at an average sales price of $186.44 per share, for net proceeds of $56,228,000. As of March 31, 2017, the Company had $942,915,000 of shares remaining authorized for issuance under this program.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 + Details
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