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Consolidated Statement Of Equity - USD ($) $ in Thousands | 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]
--- | --- | --- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2014 |  | 37,485,902 |  |  |  |  |
Balance, value at Dec. 31, 2014 | $ 1,049,933 | $ 375 | $ 1,033,896 | $ (569) | $ 6,223 | $ 1,039,925 | $ 10,008
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to common stockholders | 148,862 |  |  | 148,862 | 21,687 | 170,549 | 1,452
Comprehensive income | 172,001 |  |  |  |  |  |
Distributions to noncontrolling interest | (2,292) |  |  |  |  |  | (2,292)
Stock Issued During Period, Shares, New Issues |  | 830,506 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 49,389 | $ 8 | 49,381 |  |  | 49,389 |
Payments of Stock Issuance Costs | (275) |  | 275 |  |  | 275 |
Shares issued on stock options exercised, shares |  | 80,319 |  |  |  |  |
Shares issued on stock options exercised, value | 1 | $ 1 | 0 |  |  | 1 |
Share-based Compensation |  |  | 2,134 |  |  |  |
Share-based compensation | 2,134 |  |  |  |  | 2,134 |
Dividends declared, $1.43 per share | (128,431) |  |  | (128,431) |  | (128,431) |
Balance, shares at Dec. 31, 2015 |  | 38,396,727 |  |  |  |  |
Balance, value at Dec. 31, 2015 | 1,142,460 | $ 384 | 1,085,136 | 19,862 | 27,910 | 1,133,292 | 9,168
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to common stockholders | 151,540 |  |  | 151,540 | (22,179) | 129,361 | 1,176
Comprehensive income | 130,537 |  |  |  |  |  |
Distributions to noncontrolling interest | (1,565) |  |  |  |  |  | (1,565)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | (25,100) |  | (16,321) |  |  | (16,321) | (8,779)
Stock Issued During Period, Shares, New Issues |  | 1,395,642 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 104,190 | $ 14 | 104,176 |  |  | 104,190 |
Adjustments Related to Tax Withholding for Share-based Compensation | (1,133) |  | (1,133) |  |  | (1,133) |
Shares issued on stock options exercised, shares |  | 55,491 |  |  |  |  |
Shares issued on stock options exercised, value | (2) | $ 0 | (2) |  |  | (2) |
Share-based Compensation |  |  | 1,732 |  |  |  |
Share-based compensation | 1,732 |  |  |  |  | 1,732 |
Dividends declared, $1.43 per share | $ (141,529) |  |  | (141,529) |  | (141,529) |
Balance, shares at Dec. 31, 2016 | 39,847,860 | 39,847,860 |  |  |  |  |
Balance, value at Dec. 31, 2016 | $ 1,209,590 | $ 398 | 1,173,588 | 29,873 | 5,731 | 1,209,590 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to common stockholders | 159,365 |  |  | 159,365 | (6,553) | 152,812 |
Comprehensive income | 152,812 |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments | (7,930) |  | (7,930) |  |  | (7,930) |
Stock Issued During Period, Shares, New Issues |  | 1,661,161 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 122,237 | $ 17 | 122,220 |  |  | 122,237 |
Adjustments Related to Tax Withholding for Share-based Compensation |  |  | (571) |  |  |  |
Equity Issuance Costs | (571) |  |  |  |  | (571) |
Shares issued on stock options exercised, shares |  | 23,133 |  |  |  |  |
Shares issued on stock options exercised, value | 0 | $ 0 |  |  |  | 0 |
Share-based Compensation |  |  | 2,612 |  |  |  |
Share-based compensation | 2,612 |  |  |  |  | 2,612 |
Dividends declared, $1.43 per share | $ (156,633) |  |  | (156,633) |  | (156,633) |
Balance, shares at Dec. 31, 2017 | 41,532,154 | 41,532,154 |  |  |  |  |
Balance, value at Dec. 31, 2017 | $ 1,322,117 | $ 415 | $ 1,289,919 | $ 32,605 | $ (822) | $ 1,322,117 | $ 0

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