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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Common stock, shares outstanding | 113,838,139 |
General Partners' Capital Account, Units Outstanding | 113,838,139 |
Limited Partners' Capital Account, Units Outstanding | 4,114,276 |
Preferred Stock, Liquidation Preference Per Share | $ 50.00 |
Limited Partner [Member] |  |
General Partners' Capital Account, Units Outstanding | 113,838,139 | 113,643,166
Limited Partners' Capital Account, Units Outstanding | 4,114,276 | 4,191,586
Preferred Units, Issued | 867,846 | 867,846
Preferred Units, Outstanding | 867,846 | 867,846
Parent Company [Member] |  |
Common stock, par value per share | $ 0.01 | $ 0.01
Common stock, shares authorized | 145,000,000 | 145,000,000
Common stock, shares issued | 113,838,139 | 113,643,166
Common stock, shares outstanding | 113,838,139 | 113,643,166
Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01
Preferred Stock, Shares Authorized | 20,000,000 | 20,000,000
Preferred Stock, Shares Issued | 867,846 | 867,846
Preferred Stock, Shares Outstanding | 867,846 | 867,846
Preferred Stock, Liquidation Preference Per Share | $ 50 | $ 50

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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