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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] | Parent [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,322,117,000 | $ 415,000 | $ 1,289,919,000 | $ 32,605,000 | $ (822,000) | $ 1,322,117,000 | $ 0
Balance, shares at Dec. 31, 2017 |  | 41,532,154 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders |  |  |  | 38,432,000 | 1,922,000 | 40,354,000 |
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest |  |  |  |  |  |  | 0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | 40,354,000 |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments | (2,427,000) |  | (2,427,000) |  |  | (2,427,000) | 0
Payments of Stock Issuance Costs | (56,000) |  | 56,000 |  |  | 56,000 | 0
Share-based compensation | 1,425,000 |  | 1,425,000 |  |  | 1,425,000 | 0
Dividends declared, $1.54 per share | (41,532,000) |  |  | (41,532,000) |  | (41,532,000) | 0
Balance, shares at Dec. 31, 2017 |  | 41,532,154 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders | 76,271,000 |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 78,996,000 |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | 78,996,000 |  |  |  |  |  |
Balance, shares at Jun. 30, 2018 |  | 42,171,866 |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | (235,000) | 235,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders | 37,839,000 |  |  | 37,839,000 | 803,000 | 38,642,000 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 38,642,000 |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest |  |  |  |  |  |  | 0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | $ 38,642,000 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 628,403 |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture | 11,309 |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 44,976,000 | $ 7,000 | 44,969,000 |  |  | 44,976,000 | 0
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation | (325,000) |  | 325,000 |  |  | 325,000 | 0
Share-based compensation | 369,000 |  | 369,000 |  |  | 369,000 | 0
Dividends declared, $1.54 per share | (42,171,000) |  |  | (42,171,000) |  | (42,171,000) | 0
Balance, shares at Jun. 30, 2018 |  | 42,171,866 |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,361,372,000 | $ 422,000 | 1,333,874,000 | 24,938,000 | 2,138,000 | 1,361,372,000 | 0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,389,713,000 | $ 427,000 | 1,369,919,000 | 18,068,000 | 1,299,000 | 1,389,713,000 | 0
Balance, shares at Dec. 31, 2018 | 42,700,411 | 42,700,411 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders | $ 75,658,000 |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 70,900,000 |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | $ 70,899,000 |  |  |  |  |  |
Balance, shares at Jun. 30, 2019 | 43,357,018 | 43,357,018 |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,419,686,000 | $ 434,000 | $ 1,419,228,000 | $ 2,842,000 | $ (3,459,000) | $ 1,419,045,000 | $ 641,000

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