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Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  | 6 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Stock Options | Mar. 31, 2014 Stock Options | Jun. 30, 2013 Stock Options | Jun. 30, 2014 Stock Options | Jun. 30, 2013 Stock Options | Dec. 31, 2013 Stock Options | Jun. 30, 2014 Restricted Shares | Jun. 30, 2013 Restricted Shares | Jun. 30, 2014 Restricted Shares | Jun. 30, 2013 Restricted Shares | Jun. 30, 2014 2000 Employee Option Plan | Jun. 30, 2014 2009 Employee Option Plan | May 31, 2014 2009 Employee Option Plan | Apr. 30, 2014 2009 Employee Option Plan | Jun. 30, 2014 2000 Employee Option Plan and 2009 Employee Option Plan | Jun. 30, 2014 2004 Directors Option Plan | Jun. 30, 2014 2012 Directors Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional stock options that can be granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Common Stock reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,000,000 | 16,000,000 |  |  |
Shares available for the granting of additional stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,401,170 |  |  |  | 70,000 | 85,961
Options ratable vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 3 years |
Options exercisable period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 10 years |
Number of additional stock options expected to be granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Expense incurred for stock-based compensation plans (in dollars) | $ 9,973 | $ 8,890 | $ 19,249 | $ 17,175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense incurred for stock-based compensation plans, net of tax (in dollars) | 7,333 | 6,473 | 14,137 | 12,503 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  |  |  |  | 13,088,300 | 13,422,226 |  | 13,422,226 |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 3,023,500 | 32,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  |  |  | (1,128,975) | (314,966) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options forfeited (in shares) |  |  |  |  | (49,560) | (51,460) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the end of the period (in shares) |  |  |  |  | 14,933,265 | 13,088,300 |  | 14,933,265 |  | 13,422,226 |  |  |  |  |  |  |  |  |  |  |
Vested and non-vested options expected to vest at the end of the period (in shares) |  |  |  |  | 13,478,241 |  |  | 13,478,241 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) |  |  |  |  | 6,616,375 |  |  | 6,616,375 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) |  |  |  |  | $ 52.14 | $ 51.80 |  | $ 51.80 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options granted (in dollars per share) |  |  |  |  | $ 95.44 | $ 89.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options exercised (in dollars per share) |  |  |  |  | $ 39.80 | $ 40.41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options forfeited (in dollars per share) |  |  |  |  | $ 65.22 | $ 59.80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 61.79 | $ 52.14 |  | $ 61.79 |  | $ 51.80 |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, vested and non-vested options expected to vest (in dollars per share) |  |  |  |  | $ 60.92 |  |  | $ 60.92 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, exercisable (in dollars per share) |  |  |  |  | $ 45.58 |  |  | $ 45.58 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual term of options outstanding |  |  |  |  | 7 years 5 months 16 days | 6 years 10 months 20 days |  |  |  | 7 years 29 days |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual term of options vested options and non-vested expected to vest |  |  |  |  | 7 years 4 months 13 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual term of options exercisable |  |  |  |  | 5 years 11 months 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options outstanding (in dollars) |  |  |  |  | 515,908 | 517,164 |  | 515,908 |  | 501,706 |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options, vested and non-vested options expected to vest (in dollars) |  |  |  |  | 477,353 |  |  | 477,353 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable (in dollars) |  |  |  |  | 335,874 |  |  | 335,874 |  |  |  |  |  |  |  |  |  |  |  |  |
Status of the Company's non-vested options and changes during the year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested options at the beginning of the period (in shares) |  |  |  |  | 7,990,961 | 8,016,921 |  | 8,016,921 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested options, options granted (in shares) |  |  |  |  | 3,023,500 | 32,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested options, options vested (in shares) |  |  |  |  | (2,648,011) | (7,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested options, options forfeited (in shares) |  |  |  |  | (49,560) | (51,460) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested options at the end of the period (in shares) |  |  |  |  | 8,316,890 | 7,990,961 |  | 8,316,890 |  | 8,016,921 |  |  |  |  |  |  |  |  |  |  |
Weighted Average Fair Value at Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) |  |  |  |  | $ 14.79 | $ 14.77 |  | $ 14.77 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date, options granted (in dollars per share) |  |  |  |  | $ 17.23 | $ 21.23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date, options vested (in dollars per share) |  |  |  |  | $ 13.95 | $ 16.98 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date, options forfeited (in dollars per share) |  |  |  |  | $ 15.31 | $ 14.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 15.94 | $ 14.79 |  | $ 15.94 |  | $ 14.77 |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of stock options exercised (in dollars) |  |  |  |  | 62,893 |  | 34,093 | 78,453 | 74,635 |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of stock options vested (in dollars) |  |  |  |  | 36,939 |  | 33,647 | 37,058 | 33,781 |  |  |  |  |  |  |  |  |  |  |  |
Total compensation cost related to non-vested options not yet recognized (in dollars) |  |  |  |  | 112,848 |  |  | 112,848 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average expected amortization period |  |  |  |  |  |  |  | 3 years 9 months 11 days |  |  |  |  | 10 months 24 days |  |  |  |  |  |  |  |
Number of restricted shares issued |  |  |  |  |  |  |  |  |  |  | 9,170 | 12,824 |  | 17,045 |  |  |  |  |  |  |
Weighted-average grant date fair value of restricted shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 95.43 | $ 78.00 |  | $ 53.78 |  |  |  |  |  |  |
Total compensation cost related to non-vested restricted shares not yet recognized (in dollars) |  |  |  |  |  |  |  |  |  |  | $ 781 |  | $ 781 |  |  |  |  |  |  |  |

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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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