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Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 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 |  |  | 5,531 |
Proceeds from exercise of stock options, shares |  |  | 293 |
Tax benefit related to equity compensation |  |  | 1,351 |
Stock-based compensation expense |  |  | 4,533 |
Restricted stock granted, value |  |  | 0 |
Dividends paid |  |  | (82,656) |
Re-issuance of treasury shares (ESPP), value |  |  | 184 |
Net income | 38,898 | 34,219 | 66,894 | 57,657
Other comprehensive loss | 641 | (5,260) | 1,683 | (6,440)
Ending Balance | 1,020,080 |  | 1,020,080 |
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 |
Proceeds from exercise of stock options, value |  |  | 3 |
Proceeds from exercise of stock options, shares |  |  | 293 |
Restricted stock granted, value |  |  | 3 |
Restricted stock granted, shares |  |  | 308 |
Treasury Stock, Shares, Acquired |  |  | (43) |
Re-issuance of treasury shares (ESPP), shares |  |  | 6 |
Stock Repurchased and Retired During Period, Shares |  |  | 0 |
Stock Repurchased and Retired During Period, Value |  |  | (146) |
Ending Balance | 726 |  | 726 |
Ending Balance, shares | 72,633 |  | 72,633 |
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 |  |  | 5,528 |
Tax benefit related to equity compensation |  |  | 1,351 |
Stock-based compensation expense |  |  | 4,533 |
Restricted stock granted, value |  |  | (3) |
Re-issuance of treasury shares (ESPP), value |  |  | 161 |
Stock Repurchased and Retired During Period, Value |  |  | (54,826) |
Ending Balance | 804,762 |  | 804,762 |
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 |  |  | (82,656) |
Re-issuance of treasury shares (ESPP), value |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |
Net income |  |  | 66,888 |
Other comprehensive loss |  |  | 0 |
Ending Balance | 216,878 |  | 216,878 |
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 |  |  | 1,687 |
Ending Balance | (2,742) |  | (2,742) |
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 |
Treasury Stock, Shares, Acquired |  |  | 43 |
Treasury Stock, Value, Acquired, Cost Method |  |  | 1,416 |
Re-issuance of treasury shares (ESPP), value |  |  | 23 |
Re-issuance of treasury shares (ESPP), shares |  |  | (6) |
Stock Repurchased and Retired During Period, Shares |  |  | (14,618) |
Stock Repurchased and Retired During Period, 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 |  |  | 6 |
Other comprehensive loss |  |  | (4) |
Ending Balance | 456 |  | 456 |
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 |
Treasury Stock, Value, Acquired, Cost Method |  |  | 1,416 |
Stock Repurchased and Retired During Period, Value |  |  | $ 0 |

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