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Note 13 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Feb. 22, 2018
Preferred Stock, Par or Stated Value Per Share |  | $ 1 |  | $ 1 |
Common Stock, Par or Stated Value Per Share |  | $ 0.01 |  | $ 0.01 | $ 0.01
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 300,000
Stock Repurchased During Period, Shares |  | 5,100,000 |  |  |
Stock Repurchased During Period, Value |  | $ 75,126 |  |  |
Stock Repurchased During Period, Average Cost Per Share |  | $ 14.72 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 224,900 |  |  |
Series M Preferred Stock [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 1,380,000 |  |  |  |
Preferred stock, Fractional Interest in Share of Stock | 0.001% |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.25% | [1] | 5.25% |
Preferred Stock, Par or Stated Value Per Share | $ 1 | $ 1 | [1] | $ 1 |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 33,400 |  |  |  |
Series M Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 5.25% |  |  |  |
[1] | During January 2018, the underwriting financial institutions for the Class M Preferred Stock issuance elected to exercise the over-allotment option and as a result, the Company issued an additional 1,380,000 Class M Depositary Shares, each representing a one-thousandth fractional interest in a share of the Company's 5.250% Class M Cumulative Redeemable Preferred Stock, $1.00 par value per share. The Company received net proceeds before expenses of $33.4 million from this over-allotment issuance.

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- Definition Average cost per share of shares that have been repurchased during the period and have been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + 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 Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: 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 + Details
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