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Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Common shares | Mar. 31, 2014 Additional Paid-In Capital | Mar. 31, 2014 Earnings in Excess of Distributions | Mar. 31, 2014 Accumulated Other Comprehensive Income (Loss) | Mar. 31, 2014 Treasury shares | Mar. 31, 2014 Noncontrolling Interests | Dec. 31, 2013 Stockholders' Equity, Total
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Minimum Percentage Of Taxable Income To Be Distributed As REIT | 90.00% |  |  |  |  |  |  |  |
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |  |  |  |  |  |
Beginning Balance | $ 1,023,976 |  | $ 866 | $ 848,018 | $ 232,646 | $ (4,429) | $ (53,579) | $ 454 | $ 1,023,976
Beginning Balance, shares |  |  | 72,082 |  |  |  | 14,580 |  |
Proceeds from exercise of stock options , value | 3,275 |  | 2 | 3,273 |  |  |  |  |
Proceeds from exercise of stock options , shares | 177 |  | 177 |  |  |  |  |  |
Tax benefit related to equity compensation | 558 |  |  | 558 |  |  |  |  |
Stock based compensation expense | 452 |  |  | 452 |  |  |  |  |
Restricted stock granted, value | 0 |  | 3 | (3) |  |  |  |  |
Restricted stock granted, shares |  |  | 308 |  |  |  |  |  |
Amortization of restricted stock | 2,014 |  |  | 2,014 |  |  |  |  |
Dividends paid | (41,139) |  |  |  | (41,139) |  |  |  |
Re-issuance of treasury shares (ESPP), value | 84 |  |  | 73 | 0 |  | 11 |  |
Re-issuance of treasury shares (ESPP), shares |  |  | 3 |  |  |  | (3) |  |
Net income | 27,996 | 23,438 |  |  | 27,990 |  |  | 6 |
Other comprehensive loss | 1,046 | (1,180) |  |  |  | 1,050 |  | (4) |
Ending Balance | $ 1,018,262 |  | $ 871 | $ 854,385 | $ 219,497 | $ (3,379) | $ (53,568) | $ 456 | $ 1,023,976
Ending Balance, shares |  |  | 72,570 |  |  |  | 14,577 |  |

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