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Share Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2014, 2013 and 2012 (amounts in thousands):
| 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 |
| Year Ended December 31, 2012
| Compensation Expense |  | Compensation Capitalized |  | Compensation Equity |  | Dividends Incurred
Restricted shares | $ | 8,014 |  |  | $ | 922 |  |  | $ | 8,936 |  |  | $ | 949 |
Restricted units | 5,004 |  |  | 303 |  |  | 5,307 |  |  | 234 |
Share options | 10,970 |  |  | 782 |  |  | 11,752 |  |  | — |
ESPP discount | 844 |  |  | 121 |  |  | 965 |  |  | — |
Total | $ | 24,832 |  |  | $ | 2,128 |  |  | $ | 26,960 |  |  | $ | 1,183 |
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, 2014, 2013 and 2012:
| 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, 2011 | 8,594,020 |  |  |  | $36.81 |  |  | 697,510 |  |  |  | $34.17 |  |  | 367,620 |  |  |  | $34.80 |
Awards granted (1) | 1,164,484 |  |  |  | $60.22 |  |  | 140,980 |  |  |  | $60.20 |  |  | 70,235 |  |  |  | $57.24 |
Awards exercised/vested (2) (3) (4) | (1,608,425 | ) |  |  | $30.87 |  |  | (300,809 | ) |  |  | $23.79 |  |  | (152,821 | ) |  |  | $21.11 |
Awards forfeited | (23,795 | ) |  |  | $51.55 |  |  | (12,728 | ) |  |  | $46.25 |  |  | — |  |  | — |
Awards expired | (11,029 | ) |  |  | $35.53 |  |  | — |  |  | — |  |  | — |  |  | — |
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 |
(1) | The weighted average grant date fair value for Options granted during the years ended December 31, 2014, 2013 and 2012 was $9.21 per share, $7.97 per share and $8.55 per share, respectively.
(2) | The aggregate intrinsic value of options exercised during the years ended December 31, 2014, 2013 and 2012 was $50.8 million, $16.7 million and $46.7 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, 2014, 2013 and 2012 was $10.2 million, $13.9 million and $18.0 million, respectively.
(4) | The fair value of restricted units vested during the years ended December 31, 2014, 2013 and 2012 was $3.2 million, $5.1 million and $9.1 million, respectively
Information regarding options outstanding and exercisable | The following table summarizes information regarding options outstanding and exercisable at December 31, 2014:
|  | 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 |  | 988,826 |  |  | 4.09 |  |  | $23.07 |  |  | 988,826 |  |  |  | $23.07 |
$31.17 to $37.39 |  | 1,091,358 |  |  | 3.61 |  |  | $32.61 |  |  | 1,091,358 |  |  |  | $32.61 |
$37.40 to $43.62 |  | 702,568 |  |  | 2.36 |  |  | $40.12 |  |  | 702,568 |  |  |  | $40.12 |
$43.63 to $49.86 |  | 24,628 |  |  | 5.83 |  |  | $48.63 |  |  | 24,628 |  |  |  | $48.63 |
$49.87 to $56.09 |  | 2,343,836 |  |  | 6.21 |  |  | $53.93 |  |  | 1,387,110 |  |  |  | $53.85 |
$56.10 to $62.32 |  | 1,879,404 |  |  | 7.87 |  |  | $58.72 |  |  | 817,294 |  |  |  | $59.84 |
$18.70 to $62.32 |  | 7,030,620 |  |  | 5.57 |  |  | $46.16 |  |  | 5,011,784 |  |  |  | $42.18 |
Vested and expected to vest as of December 31, 2014 |  | 6,590,486 |  |  | 5.34 |  |  | $45.50 |  |  |  |  |  |  |
(1) | The aggregate intrinsic value of options outstanding that are vested and expected to vest as of December 31, 2014 is $180.5 million.
(2) | The aggregate intrinsic value and weighted average remaining contractual life in years of options exercisable as of December 31, 2014 is $148.7 million and 4.6 years, respectively

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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