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Consolidated Statement Of Equity - USD ($) | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Cumulative Dividends In Excess Of Net Income [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | $ (235,000) | $ 235,000
Balance, shares at Dec. 31, 2017 | 41,532,154 | 41,532,154 |  |  |
Balance, value at Dec. 31, 2017 | $ 1,322,117,000 | $ 415,000 | $ 1,289,919,000 | 32,605,000 | (822,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) attributable to common stockholders | 38,432,000 |  |  | 38,432,000 | 1,922,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 40,354,000 |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments | (2,427,000) |  | (2,427,000) |  |
Equity Issuance Costs | (56,000) |  | (56,000) |  |
Share-based compensation | 1,425,000 |  | 1,425,000 |  |
Dividends declared, $1.54 per share | (41,532,000) |  |  | (41,532,000) |
Balance, value at Mar. 31, 2018 | $ 1,319,881,000 | $ 415,000 | $ 1,288,861,000 | $ 29,270,000 | $ 1,335,000
Balance, shares at Mar. 31, 2018 | 41,532,154 | 41,532,154 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 235,000 |  |  |  |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: 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 2: 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=84159872&loc=d3e21463-112644 + Details
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