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Share Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The following tables summarize compensation information regarding the restricted shares, restricted units, share options and Employee Share Purchase Plan (“ESPP”) for the three years ended December 31, 2015, 2014 and 2013 (amounts in thousands):
| Year Ended December 31, 2015
| Compensation Expense |  | Compensation Capitalized |  | Restricted Units In-Lieu of Bonus (1) |  | Compensation Equity |  | Dividends Incurred
Restricted shares (2) | $ | 13,755 |  |  | $ | 1,311 |  |  | $ | — |  |  | $ | 15,066 |  |  | $ | 1,160 |
Restricted units (2) | 17,311 |  |  | 538 |  |  | 3,654 |  |  | 21,503 |  |  | 1,619 |
Share options | 2,746 |  |  | 1,010 |  |  | — |  |  | 3,756 |  |  | — |
ESPP discount | 795 |  |  | 89 |  |  | — |  |  | 884 |  |  | — |
Total | $ | 34,607 |  |  | $ | 2,948 |  |  | $ | 3,654 |  |  | $ | 41,209 |  |  | $ | 2,779 |
.
| Year Ended December 31, 2014
| Compensation Expense |  | Compensation Capitalized |  | Compensation Equity |  | Dividends Incurred
Restricted shares | $ | 9,244 |  |  | $ | 660 |  |  | $ | 9,904 |  |  | $ | 1,012 |
Restricted units | 11,049 |  |  | 920 |  |  | 11,969 |  |  | 1,248 |
Share options | 6,453 |  |  | 896 |  |  | 7,349 |  |  | — |
ESPP discount | 797 |  |  | 62 |  |  | 859 |  |  | — |
Total | $ | 27,543 |  |  | $ | 2,538 |  |  | $ | 30,081 |  |  | $ | 2,260 |
| Year Ended December 31, 2013
| Compensation Expense |  | Compensation Capitalized |  | Compensation Equity |  | Dividends Incurred
Restricted shares | $ | 12,185 |  |  | $ | 1,079 |  |  | $ | 13,264 |  |  | $ | 967 |
Restricted units | 13,108 |  |  | 501 |  |  | 13,609 |  |  | 520 |
Share options | 9,569 |  |  | 945 |  |  | 10,514 |  |  | — |
ESPP discount | 612 |  |  | 20 |  |  | 632 |  |  | — |
Total | $ | 35,474 |  |  | $ | 2,545 |  |  | $ | 38,019 |  |  | $ | 1,487 |
(1) | Beginning in 2015, the Company allows officers the ability to receive immediately vested restricted units (subject to the book-up provisions and two-year hold restriction) in-lieu of any percentage of their annual cash bonus.
(2) | Includes performance awards granted under the executive compensation program.
Award activity of the Share Incentive Plans | The table below summarizes the Award activity of the Share Incentive Plans for the three years ended December 31, 2015, 2014 and 2013:
| Common Shares Subject to Options |  | Weighted Average Exercise Price per Option |  | Restricted Shares |  | Weighted Average Fair Value per Restricted Share |  | Restricted Units |  | Weighted Average Fair Value per Restricted Unit
Balance at December 31, 2012 | 8,115,255 |  |  |  | $41.31 |  |  | 524,953 |  |  |  | $46.81 |  |  | 285,034 |  |  |  | $48.41 |
Awards granted (1) | 1,006,444 |  |  |  | $55.07 |  |  | 246,731 |  |  |  | $55.37 |  |  | 281,931 |  |  |  | $52.73 |
Awards exercised/vested (2) (3) (4) | (586,017 | ) |  |  | $29.34 |  |  | (253,816 | ) |  |  | $36.81 |  |  | (93,335 | ) |  |  | $32.97 |
Awards forfeited | (47,819 | ) |  |  | $56.16 |  |  | (17,634 | ) |  |  | $55.74 |  |  | (2,374 | ) |  |  | $56.72 |
Awards expired | (17,331 | ) |  |  | $47.51 |  |  | — |  |  | — |  |  | — |  |  | — |
Balance at December 31, 2013 | 8,470,532 |  |  |  | $43.67 |  |  | 500,234 |  |  |  | $55.79 |  |  | 471,256 |  |  |  | $55.67 |
Awards granted (1) | 667,877 |  |  |  | $56.72 |  |  | 176,457 |  |  |  | $56.56 |  |  | 201,507 |  |  |  | $53.82 |
Awards exercised/vested (2) (3) (4) | (2,086,380 | ) |  |  | $39.34 |  |  | (175,344 | ) |  |  | $53.44 |  |  | (60,294 | ) |  |  | $53.71 |
Awards forfeited | (19,022 | ) |  |  | $56.32 |  |  | (6,735 | ) |  |  | $56.57 |  |  | (667 | ) |  |  | $52.08 |
Awards expired | (2,387 | ) |  |  | $55.24 |  |  | — |  |  | — |  |  | — |  |  | — |
Conversion of restricted shares to restricted units | — |  |  | — |  |  | (12,146 | ) |  | — |  |  | 12,146 |  |  | — |
Balance at December 31, 2014 | 7,030,620 |  |  |  | $46.16 |  |  | 482,466 |  |  |  | $56.89 |  |  | 623,948 |  |  |  | $53.38 |
Awards granted (1) (5) | 171,150 |  |  |  | $80.15 |  |  | 174,112 |  |  |  | $79.65 |  |  | 337,505 |  |  |  | $81.87 |
Awards exercised/vested (2) (3) (4) | (1,456,363 | ) |  |  | $42.64 |  |  | (127,174 | ) |  |  | $60.21 |  |  | (72,003 | ) |  |  | $57.12 |
Awards forfeited | (9,550 | ) |  |  | $64.53 |  |  | (5,970 | ) |  |  | $62.11 |  |  | (2,009 | ) |  |  | $64.39 |
Awards expired | (1,492 | ) |  |  | $39.86 |  |  | — |  |  | — |  |  | — |  |  | — |
Conversion of restricted shares to restricted units | — |  |  | — |  |  | (1,284 | ) |  | — |  |  | 1,284 |  |  | — |
Balance at December 31, 2015 | 5,734,365 |  |  |  | $48.04 |  |  | 522,150 |  |  |  | $63.67 |  |  | 888,725 |  |  |  | $63.91 |
(1) | The weighted average grant date fair value for Options granted during the years ended December 31, 2015, 2014 and 2013 was $13.67 per share, $9.21 per share and $7.97 per share, respectively.
(2) | The aggregate intrinsic value of options exercised during the years ended December 31, 2015, 2014 and 2013 was $52.9 million, $50.8 million and $16.7 million, respectively. These values were calculated as the difference between the strike price of the underlying awards and the per share price at which each respective award was exercised.
(3) | The fair value of restricted shares vested during the years ended December 31, 2015, 2014 and 2013 was $10.2 million, $10.2 million and $13.9 million, respectively.
(4) | The fair value of restricted units vested during the years ended December 31, 2015, 2014 and 2013 was $5.8 million, $3.4 million and $5.1 million, respectively.
(5) | Includes performance awards granted under the executive compensation program.
Information regarding options outstanding and exercisable | The following table summarizes information regarding options outstanding and exercisable at December 31, 2015:
|  | Options Outstanding (1) |  | Options Exercisable (2)
Range of Exercise Prices |  | Options |  | Weighted Average Remaining Contractual Life in Years |  | Weighted Average Exercise Price |  | Options |  | Weighted Average Exercise Price
$18.70 to $24.93 |  | 865,289 |  |  | 3.10 |  |  | $23.07 |  |  | 865,289 |  |  |  | $23.07 |
$24.94 to $37.39 |  | 634,733 |  |  | 4.10 |  |  | $32.97 |  |  | 634,733 |  |  |  | $32.97 |
$37.40 to $43.62 |  | 446,345 |  |  | 1.17 |  |  | $40.53 |  |  | 446,345 |  |  |  | $40.53 |
$43.63 to $49.86 |  | 2,056 |  |  | 4.83 |  |  | $48.63 |  |  | 2,056 |  |  |  | $48.63 |
$49.87 to $56.09 |  | 1,969,539 |  |  | 5.58 |  |  | $53.96 |  |  | 1,278,111 |  |  |  | $54.06 |
$56.10 to $62.32 |  | 1,648,650 |  |  | 6.92 |  |  | $58.65 |  |  | 1,209,674 |  |  |  | $59.44 |
$68.56 to $74.78 |  | 2,353 |  |  | 9.49 |  |  | $71.35 |  |  | — |  |  | — |
$74.79 to $81.01 |  | 165,400 |  |  | 9.11 |  |  | $80.27 |  |  | 782 |  |  |  | $80.27 |
$18.70 to $81.01 |  | 5,734,365 |  |  | 5.19 |  |  | $48.04 |  |  | 4,436,990 |  |  |  | $45.11 |
Vested and expected to vest as of December 31, 2015 |  | 5,696,241 |  |  | 5.07 |  |  | $47.96 |  |  |  |  |  |  |
(1) | The aggregate intrinsic value of options outstanding that are vested and expected to vest as of December 31, 2015 is $191.6 million.
(2) | The aggregate intrinsic value and weighted average remaining contractual life in years of options exercisable as of December 31, 2015 is $161.9 million and 4.6 years, respectively.
Note: The aggregate intrinsic values in Notes (1) and (2) above were both calculated as the excess, if any, between the Company’s closing share price of $81.59 per share on December 31, 2015 and the strike price of the underlying awards.

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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