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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |
Beginning Balance |  |  | $ 1,023,976 |
Proceeds from exercise of stock options, value |  |  | 6,384 |
Proceeds from exercise of stock options, shares |  |  | 338,000 |
Tax benefit related to equity compensation |  |  | 1,498 |
Stock-based compensation expense |  |  | 885 |
Amortization of restricted stock |  |  | 5,378 |
Restricted stock granted, value |  |  | 0 |
Restricted stock canceled |  |  | 0 |
Dividends paid |  |  | (124,084) |
Re-issuance of treasury shares (ESPP), value |  |  | 185 |
Issuance of common stock (ESPP), value |  |  | 92 |
Net income | 38,965 | 29,909 | 105,859 | 87,566
Other comprehensive loss | (7,983) | 648 | (6,301) | (5,791)
Ending Balance | 1,066,752 |  | 1,066,752 |
Common shares |  |  |  |
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |
Beginning Balance |  |  | 866 |
Beginning Balance, shares |  |  | 72,082,000 |
Proceeds from exercise of stock options, value |  |  | 3 |
Proceeds from exercise of stock options, shares |  |  | 338,000 |
Restricted stock granted, value |  |  | 3 |
Restricted stock granted, shares |  |  | 310,000 |
Restricted stock canceled (shares) |  |  | (22,000) |
Restricted stock canceled |  |  | 0 |
Issuance of common stock (prospectus supplement), value |  |  | 15 |
Issuance of common stock (prospectus supplement), shares |  |  | 1,483,000 |
Shares withheld for net settlement of share-based awards (shares) |  |  | (54,000) |
Re-issuance of treasury shares (ESPP), shares |  |  | 5,000 |
Issuance of common stock (ESPP), shares |  |  | 3,000 |
Retirement of treasury shares, shares |  |  | 0 |
Retirement of treasury shares, value |  |  | (146) |
Ending Balance | 741 |  | 741 |
Ending Balance, shares | 74,145,000 |  | 74,145,000 |
Additional Paid-In Capital |  |  |  |
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |
Beginning Balance |  |  | 848,018 |
Proceeds from exercise of stock options, value |  |  | 6,381 |
Tax benefit related to equity compensation |  |  | 1,498 |
Stock-based compensation expense |  |  | 885 |
Amortization of restricted stock |  |  | 5,378 |
Restricted stock granted, value |  |  | (3) |
Issuance of common stock (prospectus supplement), value |  |  | 54,709 |
Shares withheld for net settlements of share-based awards |  |  | (428) |
Re-issuance of treasury shares (ESPP), value |  |  | 162 |
Issuance of common stock (ESPP), value |  |  | 92 |
Retirement of treasury shares, value |  |  | (54,826) |
Ending Balance | 861,866 |  | 861,866 |
Earnings in Excess of Distributions |  |  |  |
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |
Beginning Balance |  |  | 232,646 |
Dividends paid |  |  | (124,084) |
Re-issuance of treasury shares (ESPP), value |  |  |  |
Retirement of treasury shares, value |  |  |  |
Net income |  |  | 105,879 |
Other comprehensive loss |  |  | 0 |
Ending Balance | 214,441 |  | 214,441 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |
Beginning Balance |  |  | (4,429) |
Other comprehensive loss |  |  | (6,270) |
Ending Balance | (10,699) |  | (10,699) |
Treasury shares |  |  |  |
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |
Beginning Balance |  |  | (53,579) |
Beginning Balance, shares |  |  | 14,581,000 |
Shares withheld for net settlement of share-based awards (shares) |  |  | (43,000) |
Shares withheld for net settlements of share-based awards |  |  | (1,416) |
Re-issuance of treasury shares (ESPP), value |  |  | 23 |
Re-issuance of treasury shares (ESPP), shares |  |  | (6,000) |
Retirement of treasury shares, shares |  |  | (14,618,000) |
Retirement of treasury shares, value |  |  | 54,972 |
Ending Balance | 0 |  | 0 |
Ending Balance, shares | 0 |  | 0 |
Noncontrolling Interests |  |  |  |
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |
Beginning Balance |  |  | 454 |
Net income |  |  | (20) |
Other comprehensive loss |  |  | (31) |
Ending Balance | 403 |  | 403 |
Stockholders' Equity, Total |  |  |  |
Changes in shareholders' equity that are attributable to the Company's shareholders and to non controlling interests |  |  |  |
Beginning Balance |  |  | 1,023,976 |
Issuance of common stock (prospectus supplement), value |  |  | 54,724 |
Shares withheld for net settlements of share-based awards |  |  | (1,844) |
Retirement of treasury shares, value |  |  | $ 0 |

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